61239242502720 has 84 divisors (see below), whose sum is σ = 210637477868220. Its totient is φ = 16330464666624.

The previous prime is 61239242502703. The next prime is 61239242502743. The reversal of 61239242502720 is 2720524293216.

61239242502720 is a `hidden beast` number, since 6 + 1 + 2 + 39 + 2 + 42 + 502 + 72 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31623617286144 + 29615625216576 = 5623488^2 + 5442024^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10631810055 + ... + 10631815814.

Almost surely, 2^{61239242502720} is an apocalyptic number.

61239242502720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61239242502720 is an abundant number, since it is smaller than the sum of its proper divisors (149398235365500).

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

61239242502720 is a wasteful number, since it uses less digits than its factorization.

61239242502720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21263625892 (or 21263625879 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

Adding to 61239242502720 its reverse (2720524293216), we get a palindrome (63959766795936).

The spelling of 61239242502720 in words is "sixty-one trillion, two hundred thirty-nine billion, two hundred forty-two million, five hundred two thousand, seven hundred twenty".