6900400645 has 8 divisors (see below), whose sum is σ = 8456661504. Its totient is φ = 5402866704.

The previous prime is 6900400609. The next prime is 6900400649. The reversal of 6900400645 is 5460040096.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6900400645 - 2²³ = 6892012037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6900400645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6900400649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14681469 + ... + 14681938.

It is an arithmetic number, because the mean of its divisors is an integer number (1057082688).

Almost surely, 2^6900400645 is an apocalyptic number.

It is an amenable number.

6900400645 is a deficient number, since it is larger than the sum of its proper divisors (1556260859).

6900400645 is a wasteful number, since it uses less digits than its factorization.

6900400645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29363459.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 6900400645 is about 83068.6501936802. The cubic root of 6900400645 is about 1903.8151085565.

The spelling of 6900400645 in words is "six billion, nine hundred million, four hundred thousand, six hundred forty-five".