61601511656 has 16 divisors (see below), whose sum is σ = 121581931200. Its totient is φ = 29179663344.

The previous prime is 61601511619. The next prime is 61601511659. The reversal of 61601511656 is 65611510616.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (61601511659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202636400 + ... + 202636703.

It is an arithmetic number, because the mean of its divisors is an integer number (7598870700).

Almost surely, 2^61601511656 is an apocalyptic number.

It is an amenable number.

61601511656 is a deficient number, since it is larger than the sum of its proper divisors (59980419544).

61601511656 is a wasteful number, since it uses less digits than its factorization.

61601511656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405273128 (or 405273124 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 61601511656 in words is "sixty-one billion, six hundred one million, five hundred eleven thousand, six hundred fifty-six".