61686513495 has 96 divisors (see below), whose sum is σ = 120745497600. Its totient is φ = 30092840064.

The previous prime is 61686513491. The next prime is 61686513541. The reversal of 61686513495 is 59431568616.

61686513495 is a `hidden beast` number, since 6 + 1 + 6 + 86 + 513 + 49 + 5 = 666.

It is not a de Polignac number, because 61686513495 - 2² = 61686513491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61686513491) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 623394 + ... + 715536.

It is an arithmetic number, because the mean of its divisors is an integer number (1257765600).

Almost surely, 2^61686513495 is an apocalyptic number.

61686513495 is a deficient number, since it is larger than the sum of its proper divisors (59058984105).

61686513495 is a wasteful number, since it uses less digits than its factorization.

61686513495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92211 (or 92199 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The spelling of 61686513495 in words is "sixty-one billion, six hundred eighty-six million, five hundred thirteen thousand, four hundred ninety-five".