61215101056 has 32 divisors (see below), whose sum is σ = 128370488400. Its totient is φ = 28996625664.

The previous prime is 61215101041. The next prime is 61215101069. The reversal of 61215101056 is 65010151216.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12582910 + ... + 12587773.

Almost surely, 2^61215101056 is an apocalyptic number.

It is an amenable number.

61215101056 is an abundant number, since it is smaller than the sum of its proper divisors (67155387344).

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

61215101056 is a wasteful number, since it uses less digits than its factorization.

61215101056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25170716 (or 25170704 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The spelling of 61215101056 in words is "sixty-one billion, two hundred fifteen million, one hundred one thousand, fifty-six".