61896140464 has 40 divisors (see below), whose sum is σ = 122259952640. Its totient is φ = 30349332288.

The previous prime is 61896140441. The next prime is 61896140513. The reversal of 61896140464 is 46404169816.

It is a super-2 number, since 2×61896140464² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109597 + ... + 368515.

It is an arithmetic number, because the mean of its divisors is an integer number (3056498816).

Almost surely, 2^61896140464 is an apocalyptic number.

It is an amenable number.

61896140464 is a deficient number, since it is larger than the sum of its proper divisors (60363812176).

61896140464 is a wasteful number, since it uses less digits than its factorization.

61896140464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259217 (or 259211 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 49.

The spelling of 61896140464 in words is "sixty-one billion, eight hundred ninety-six million, one hundred forty thousand, four hundred sixty-four".