61156568928 has 96 divisors (see below), whose sum is σ = 197582789376. Its totient is φ = 16129202688.

The previous prime is 61156568909. The next prime is 61156568929. The reversal of 61156568928 is 82986565116.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61156568929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3491526 + ... + 3508997.

It is an arithmetic number, because the mean of its divisors is an integer number (2058154056).

Almost surely, 2^61156568928 is an apocalyptic number.

It is an amenable number.

61156568928 is an abundant number, since it is smaller than the sum of its proper divisors (136426220448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61156568928 is a wasteful number, since it uses less digits than its factorization.

61156568928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000556 (or 7000548 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 57.

The spelling of 61156568928 in words is "sixty-one billion, one hundred fifty-six million, five hundred sixty-eight thousand, nine hundred twenty-eight".