61521231696 has 40 divisors (see below), whose sum is σ = 159081484800. Its totient is φ = 20487511296.

The previous prime is 61521231683. The next prime is 61521231757. The reversal of 61521231696 is 69613212516.

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, 560560 + ... + 661263.

It is an arithmetic number, because the mean of its divisors is an integer number (3977037120).

Almost surely, 2^61521231696 is an apocalyptic number.

It is an amenable number.

61521231696 is an abundant number, since it is smaller than the sum of its proper divisors (97560253104).

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

61521231696 is a wasteful number, since it uses less digits than its factorization.

61521231696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222883 (or 1222877 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The spelling of 61521231696 in words is "sixty-one billion, five hundred twenty-one million, two hundred thirty-one thousand, six hundred ninety-six".