81503868980 has 12 divisors (see below), whose sum is σ = 171158124900. Its totient is φ = 32601547584.

The previous prime is 81503868977. The next prime is 81503869043. The reversal of 81503868980 is 8986830518.

It can be written as a sum of positive squares in 2 ways, for example, as 9785957776 + 71717911204 = 98924^2 + 267802^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2037596705 + ... + 2037596744.

It is an arithmetic number, because the mean of its divisors is an integer number (14263177075).

Almost surely, 2^81503868980 is an apocalyptic number.

It is an amenable number.

81503868980 is an abundant number, since it is smaller than the sum of its proper divisors (89654255920).

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

81503868980 is a wasteful number, since it uses less digits than its factorization.

81503868980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4075193458 (or 4075193456 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 56.

The spelling of 81503868980 in words is "eighty-one billion, five hundred three million, eight hundred sixty-eight thousand, nine hundred eighty".