81914980537 has 16 divisors (see below), whose sum is σ = 91076392960. Its totient is φ = 73162958400.

The previous prime is 81914980489. The next prime is 81914980561. The reversal of 81914980537 is 73508941918.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81914980537 - 2⁷ = 81914980409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81914980597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3385639 + ... + 3409747.

It is an arithmetic number, because the mean of its divisors is an integer number (5692274560).

Almost surely, 2^81914980537 is an apocalyptic number.

It is an amenable number.

81914980537 is a deficient number, since it is larger than the sum of its proper divisors (9161412423).

81914980537 is a wasteful number, since it uses less digits than its factorization.

81914980537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32584.

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 81914980537 in words is "eighty-one billion, nine hundred fourteen million, nine hundred eighty thousand, five hundred thirty-seven".