81598939675 has 12 divisors (see below), whose sum is σ = 110381111496. Its totient is φ = 59344683200.

The previous prime is 81598939673. The next prime is 81598939699. The reversal of 81598939675 is 57693989518.

It is not a de Polignac number, because 81598939675 - 2¹ = 81598939673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81598939673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148361434 + ... + 148361983.

It is an arithmetic number, because the mean of its divisors is an integer number (9198425958).

Almost surely, 2^81598939675 is an apocalyptic number.

81598939675 is a deficient number, since it is larger than the sum of its proper divisors (28782171821).

81598939675 is a wasteful number, since it uses less digits than its factorization.

81598939675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296723438 (or 296723433 counting only the distinct ones).

The product of its digits is 146966400, while the sum is 70.

The spelling of 81598939675 in words is "eighty-one billion, five hundred ninety-eight million, nine hundred thirty-nine thousand, six hundred seventy-five".