61217786635563 has 64 divisors (see below), whose sum is σ = 88636102410240. Its totient is φ = 37500325688448.

The previous prime is 61217786635547. The next prime is 61217786635597. The reversal of 61217786635563 is 36553668771216.

It is not a de Polignac number, because 61217786635563 - 2⁴ = 61217786635547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61217786635494 and 61217786635503.

It is not an unprimeable number, because it can be changed into a prime (61217786635463) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38428770 + ... + 39990072.

It is an arithmetic number, because the mean of its divisors is an integer number (1384939100160).

Almost surely, 2^{61217786635563} is an apocalyptic number.

61217786635563 is a deficient number, since it is larger than the sum of its proper divisors (27418315774677).

61217786635563 is a wasteful number, since it uses less digits than its factorization.

61217786635563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561648.

The product of its digits is 228614400, while the sum is 66.

The spelling of 61217786635563 in words is "sixty-one trillion, two hundred seventeen billion, seven hundred eighty-six million, six hundred thirty-five thousand, five hundred sixty-three".