61172839500 has 48 divisors (see below), whose sum is σ = 178135312992. Its totient is φ = 16312756800.

The previous prime is 61172839487. The next prime is 61172839501. The reversal of 61172839500 is 593827116.

It is not an unprimeable number, because it can be changed into a prime (61172839501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20389447 + ... + 20392446.

It is an arithmetic number, because the mean of its divisors is an integer number (3711152354).

Almost surely, 2^61172839500 is an apocalyptic number.

61172839500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61172839500 is an abundant number, since it is smaller than the sum of its proper divisors (116962473492).

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

61172839500 is a wasteful number, since it uses less digits than its factorization.

61172839500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40781915 (or 40781903 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 61172839500 in words is "sixty-one billion, one hundred seventy-two million, eight hundred thirty-nine thousand, five hundred".