61686890934651 has 12 divisors (see below), whose sum is σ = 89108923349160. Its totient is φ = 41121992520960.

The previous prime is 61686890934637. The next prime is 61686890934659. The reversal of 61686890934651 is 15643909868616.

61686890934651 is a `hidden beast` number, since 6 + 1 + 6 + 86 + 89 + 0 + 9 + 3 + 465 + 1 = 666.

61686890934651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61686890934651 - 2²¹ = 61686888837499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61686890934651.

It is not an unprimeable number, because it can be changed into a prime (61686890934659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 216636105 + ... + 216920666.

It is an arithmetic number, because the mean of its divisors is an integer number (7425743612430).

Almost surely, 2^{61686890934651} is an apocalyptic number.

61686890934651 is a deficient number, since it is larger than the sum of its proper divisors (27422032414509).

61686890934651 is a wasteful number, since it uses less digits than its factorization.

61686890934651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433572586 (or 433572583 counting only the distinct ones).

The product of its (nonzero) digits is 403107840, while the sum is 72.

The spelling of 61686890934651 in words is "sixty-one trillion, six hundred eighty-six billion, eight hundred ninety million, nine hundred thirty-four thousand, six hundred fifty-one".