61856888865816 has 128 divisors (see below), whose sum is σ = 173163879302400. Its totient is φ = 18254677440000.

The previous prime is 61856888865719. The next prime is 61856888865911.

61856888865816 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×61856888865816² (a number of 28 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 31 ways as a sum of consecutive naturals, for example, 17388786 + ... + 20641793.

It is an arithmetic number, because the mean of its divisors is an integer number (1352842807050).

Almost surely, 2^{61856888865816} is an apocalyptic number.

61856888865816 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

61856888865816 is an abundant number, since it is smaller than the sum of its proper divisors (111306990436584).

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

61856888865816 is a wasteful number, since it uses less digits than its factorization.

61856888865816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38030761 (or 38030757 counting only the distinct ones).

The product of its digits is 8493465600, while the sum is 84.

The spelling of 61856888865816 in words is "sixty-one trillion, eight hundred fifty-six billion, eight hundred eighty-eight million, eight hundred sixty-five thousand, eight hundred sixteen".