81950489695 has 32 divisors (see below), whose sum is σ = 102943368000. Its totient is φ = 62548899840.

The previous prime is 81950489681. The next prime is 81950489743. The reversal of 81950489695 is 59698405918.

It is not a de Polignac number, because 81950489695 - 2⁷ = 81950489567 is a prime.

It is a super-2 number, since 2×81950489695² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5983255 + ... + 5996935.

It is an arithmetic number, because the mean of its divisors is an integer number (3216980250).

Almost surely, 2^81950489695 is an apocalyptic number.

81950489695 is a deficient number, since it is larger than the sum of its proper divisors (20992878305).

81950489695 is a wasteful number, since it uses less digits than its factorization.

81950489695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14203.

The product of its (nonzero) digits is 27993600, while the sum is 64.

The spelling of 81950489695 in words is "eighty-one billion, nine hundred fifty million, four hundred eighty-nine thousand, six hundred ninety-five".