81914980538 has 8 divisors (see below), whose sum is σ = 123141339732. Its totient is φ = 40867867296.

The previous prime is 81914980489. The next prime is 81914980561. The reversal of 81914980538 is 83508941918.

It can be written as a sum of positive squares in 2 ways, for example, as 77460352489 + 4454628049 = 278317^2 + 66743^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 44810345 + ... + 44812172.

Almost surely, 2^81914980538 is an apocalyptic number.

81914980538 is a deficient number, since it is larger than the sum of its proper divisors (41226359194).

81914980538 is a wasteful number, since it uses less digits than its factorization.

81914980538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89622976.

The product of its (nonzero) digits is 2488320, while the sum is 56.

The spelling of 81914980538 in words is "eighty-one billion, nine hundred fourteen million, nine hundred eighty thousand, five hundred thirty-eight".