81337508760 has 32 divisors (see below), whose sum is σ = 244012526640. Its totient is φ = 21690002304.

The previous prime is 81337508743. The next prime is 81337508761. The reversal of 81337508760 is 6780573318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81337508761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338906167 + ... + 338906406.

Almost surely, 2^81337508760 is an apocalyptic number.

It is an amenable number.

81337508760 is an abundant number, since it is smaller than the sum of its proper divisors (162675017880).

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

81337508760 is a wasteful number, since it uses less digits than its factorization.

81337508760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677812587 (or 677812583 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 81337508760 in words is "eighty-one billion, three hundred thirty-seven million, five hundred eight thousand, seven hundred sixty".