61555111217756 has 72 divisors (see below), whose sum is σ = 117587474709264. Its totient is φ = 28181379133440.

The previous prime is 61555111217731. The next prime is 61555111217819. The reversal of 61555111217756 is 65771211155516.

It is a junction number, because it is equal to n+sod(n) for n = 61555111217698 and 61555111217707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44592566 + ... + 45952226.

It is an arithmetic number, because the mean of its divisors is an integer number (1633159370962).

Almost surely, 2^{61555111217756} is an apocalyptic number.

It is an amenable number.

61555111217756 is a deficient number, since it is larger than the sum of its proper divisors (56032363491508).

61555111217756 is a wasteful number, since it uses less digits than its factorization.

61555111217756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360231 (or 1360216 counting only the distinct ones).

The product of its digits is 2205000, while the sum is 53.

The spelling of 61555111217756 in words is "sixty-one trillion, five hundred fifty-five billion, one hundred eleven million, two hundred seventeen thousand, seven hundred fifty-six".