81950492575 has 12 divisors (see below), whose sum is σ = 116135555440. Its totient is φ = 56194623360.

The previous prime is 81950492567. The next prime is 81950492593. The reversal of 81950492575 is 57529405918.

It is not a de Polignac number, because 81950492575 - 2³ = 81950492567 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234144090 + ... + 234144439.

Almost surely, 2^81950492575 is an apocalyptic number.

81950492575 is a deficient number, since it is larger than the sum of its proper divisors (34185062865).

81950492575 is a wasteful number, since it uses less digits than its factorization.

81950492575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468288546 (or 468288541 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 55.

The spelling of 81950492575 in words is "eighty-one billion, nine hundred fifty million, four hundred ninety-two thousand, five hundred seventy-five".