81101374668 has 36 divisors (see below), whose sum is σ = 207476215128. Its totient is φ = 26708082240.

The previous prime is 81101374667. The next prime is 81101374703. The reversal of 81101374668 is 86647310118.

81101374668 is a `hidden beast` number, since 81 + 101 + 3 + 7 + 466 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×81101374668² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81101374663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13568193 + ... + 13574168.

It is an arithmetic number, because the mean of its divisors is an integer number (5763228198).

Almost surely, 2^81101374668 is an apocalyptic number.

It is an amenable number.

81101374668 is an abundant number, since it is smaller than the sum of its proper divisors (126374840460).

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

81101374668 is a wasteful number, since it uses less digits than its factorization.

81101374668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27142454 (or 27142449 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 81101374668 in words is "eighty-one billion, one hundred one million, three hundred seventy-four thousand, six hundred sixty-eight".