61438959180 has 72 divisors (see below), whose sum is σ = 186491489184. Its totient is φ = 16372588800.

The previous prime is 61438959173. The next prime is 61438959181. The reversal of 61438959180 is 8195983416.

61438959180 is a `hidden beast` number, since 6 + 1 + 43 + 8 + 9 + 591 + 8 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (61438959181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151345 + ... + 381815.

It is an arithmetic number, because the mean of its divisors is an integer number (2590159572).

Almost surely, 2^61438959180 is an apocalyptic number.

61438959180 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61438959180 is an abundant number, since it is smaller than the sum of its proper divisors (125052530004).

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

61438959180 is a wasteful number, since it uses less digits than its factorization.

61438959180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231967 (or 231962 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 61438959180 in words is "sixty-one billion, four hundred thirty-eight million, nine hundred fifty-nine thousand, one hundred eighty".