6940155645 has 12 divisors (see below), whose sum is σ = 12029603196. Its totient is φ = 3701416320.

The previous prime is 6940155617. The next prime is 6940155647. The reversal of 6940155645 is 5465510496.

6940155645 is a `hidden beast` number, since 6 + 94 + 0 + 1 + 556 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3432436569 + 3507719076 = 58587^2 + 59226^2 .

It is not a de Polignac number, because 6940155645 - 2²⁶ = 6873046781 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 154225681 = 6940155645 / (6 + 9 + 4 + 0 + 1 + 5 + 5 + 6 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 6940155645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6940155647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77112796 + ... + 77112885.

It is an arithmetic number, because the mean of its divisors is an integer number (1002466933).

Almost surely, 2^6940155645 is an apocalyptic number.

It is an amenable number.

6940155645 is a deficient number, since it is larger than the sum of its proper divisors (5089447551).

6940155645 is a wasteful number, since it uses less digits than its factorization.

6940155645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154225692 (or 154225689 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The square root of 6940155645 is about 83307.5965623784. The cubic root of 6940155645 is about 1907.4642340562.

The spelling of 6940155645 in words is "six billion, nine hundred forty million, one hundred fifty-five thousand, six hundred forty-five".