81537014740 has 12 divisors (see below), whose sum is σ = 171227730996. Its totient is φ = 32614805888.

The previous prime is 81537014717. The next prime is 81537014761. The reversal of 81537014740 is 4741073518.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 41349595716 + 40187419024 = 203346^2 + 200468^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81537014693 and 81537014702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2038425349 + ... + 2038425388.

It is an arithmetic number, because the mean of its divisors is an integer number (14268977583).

Almost surely, 2^81537014740 is an apocalyptic number.

It is an amenable number.

81537014740 is an abundant number, since it is smaller than the sum of its proper divisors (89690716256).

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

81537014740 is a wasteful number, since it uses less digits than its factorization.

81537014740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4076850746 (or 4076850744 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The spelling of 81537014740 in words is "eighty-one billion, five hundred thirty-seven million, fourteen thousand, seven hundred forty".