61657496512 has 28 divisors (see below), whose sum is σ = 123027593416. Its totient is φ = 30658417920.

The previous prime is 61657496507. The next prime is 61657496521. The reversal of 61657496512 is 21569475616.

It is a happy number.

61657496512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61657496512² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61657496512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2649738 + ... + 2672905.

It is an arithmetic number, because the mean of its divisors is an integer number (4393842622).

Almost surely, 2^61657496512 is an apocalyptic number.

It is an amenable number.

61657496512 is a deficient number, since it is larger than the sum of its proper divisors (61370096904).

61657496512 is a wasteful number, since it uses less digits than its factorization.

61657496512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5322836 (or 5322826 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 52.

The spelling of 61657496512 in words is "sixty-one billion, six hundred fifty-seven million, four hundred ninety-six thousand, five hundred twelve".