61539124464 has 40 divisors (see below), whose sum is σ = 176640080720. Its totient is φ = 20513041344.

The previous prime is 61539124459. The next prime is 61539124469. The reversal of 61539124464 is 46442193516.

61539124464 is a `hidden beast` number, since 6 + 1 + 539 + 12 + 44 + 64 = 666.

It is an interprime number because it is at equal distance from previous prime (61539124459) and next prime (61539124469).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61539124469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71225407 + ... + 71226270.

It is an arithmetic number, because the mean of its divisors is an integer number (4416002018).

Almost surely, 2^61539124464 is an apocalyptic number.

It is an amenable number.

61539124464 is an abundant number, since it is smaller than the sum of its proper divisors (115100956256).

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

61539124464 is a wasteful number, since it uses less digits than its factorization.

61539124464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142451694 (or 142451682 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 61539124464 in words is "sixty-one billion, five hundred thirty-nine million, one hundred twenty-four thousand, four hundred sixty-four".