61526256864 has 48 divisors (see below), whose sum is σ = 161646790032. Its totient is φ = 20490928128.

The previous prime is 61526256823. The next prime is 61526256887. The reversal of 61526256864 is 46865262516.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×61526256864² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167239 + ... + 388614.

It is an arithmetic number, because the mean of its divisors is an integer number (3367641459).

Almost surely, 2^61526256864 is an apocalyptic number.

It is an amenable number.

61526256864 is an abundant number, since it is smaller than the sum of its proper divisors (100120533168).

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

61526256864 is a wasteful number, since it uses less digits than its factorization.

61526256864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557019 (or 557011 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 51.

The spelling of 61526256864 in words is "sixty-one billion, five hundred twenty-six million, two hundred fifty-six thousand, eight hundred sixty-four".