61686887435874 has 40 divisors (see below), whose sum is σ = 138749889706560. Its totient is φ = 20484112163544.

The previous prime is 61686887435839. The next prime is 61686887435989. The reversal of 61686887435874 is 47853478868616.

61686887435874 is a `hidden beast` number, since 6 + 1 + 68 + 68 + 87 + 4 + 358 + 74 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a junction number, because it is equal to n+sod(n) for n = 61686887435793 and 61686887435802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 723879934 + ... + 723965145.

It is an arithmetic number, because the mean of its divisors is an integer number (3468747242664).

Almost surely, 2^{61686887435874} is an apocalyptic number.

61686887435874 is an abundant number, since it is smaller than the sum of its proper divisors (77063002270686).

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

61686887435874 is a wasteful number, since it uses less digits than its factorization.

61686887435874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447845356 (or 1447845347 counting only the distinct ones).

The product of its digits is 10404495360, while the sum is 81.

The spelling of 61686887435874 in words is "sixty-one trillion, six hundred eighty-six billion, eight hundred eighty-seven million, four hundred thirty-five thousand, eight hundred seventy-four".