61881801696 has 144 divisors (see below), whose sum is σ = 206741611440. Its totient is φ = 17309583360.

The previous prime is 61881801617. The next prime is 61881801697. The reversal of 61881801696 is 69610818816.

61881801696 is a `hidden beast` number, since 618 + 8 + 1 + 8 + 0 + 16 + 9 + 6 = 666.

61881801696 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×61881801696² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61881801697) 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, 710101 + ... + 792468.

It is an arithmetic number, because the mean of its divisors is an integer number (1435705635).

Almost surely, 2^61881801696 is an apocalyptic number.

61881801696 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

61881801696 is an abundant number, since it is smaller than the sum of its proper divisors (144859809744).

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

61881801696 is a wasteful number, since it uses less digits than its factorization.

61881801696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502609 (or 1502598 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The spelling of 61881801696 in words is "sixty-one billion, eight hundred eighty-one million, eight hundred one thousand, six hundred ninety-six".