6948155781 has 80 divisors (see below), whose sum is σ = 12092720640. Its totient is φ = 3893909760.

The previous prime is 6948155749. The next prime is 6948155783. The reversal of 6948155781 is 1875518496.

It is a happy number.

6948155781 is a `hidden beast` number, since 6 + 9 + 4 + 8 + 1 + 557 + 81 = 666.

It is not a de Polignac number, because 6948155781 - 2⁵ = 6948155749 is a prime.

It is a super-2 number, since 2×6948155781² = 96553737514087439922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6948155783) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 8107105 + ... + 8107961.

It is an arithmetic number, because the mean of its divisors is an integer number (151159008).

Almost surely, 2^6948155781 is an apocalyptic number.

It is an amenable number.

6948155781 is a deficient number, since it is larger than the sum of its proper divisors (5144564859).

6948155781 is a wasteful number, since it uses less digits than its factorization.

6948155781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136 (or 1127 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 54.

The square root of 6948155781 is about 83355.5983782733. The cubic root of 6948155781 is about 1908.1968839788.

The spelling of 6948155781 in words is "six billion, nine hundred forty-eight million, one hundred fifty-five thousand, seven hundred eighty-one".