61839493660 has 24 divisors (see below), whose sum is σ = 148414785120. Its totient is φ = 21202112064.

The previous prime is 61839493643. The next prime is 61839493739. The reversal of 61839493660 is 6639493816.

It is a super-2 number, since 2×61839493660² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 220855195 + ... + 220855474.

It is an arithmetic number, because the mean of its divisors is an integer number (6183949380).

Almost surely, 2^61839493660 is an apocalyptic number.

It is an amenable number.

61839493660 is an abundant number, since it is smaller than the sum of its proper divisors (86575291460).

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

61839493660 is a wasteful number, since it uses less digits than its factorization.

61839493660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441710685 (or 441710683 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 55.

The spelling of 61839493660 in words is "sixty-one billion, eight hundred thirty-nine million, four hundred ninety-three thousand, six hundred sixty".