81738594351 has 24 divisors (see below), whose sum is σ = 122536093680. Its totient is φ = 52441917696.

The previous prime is 81738594341. The next prime is 81738594359. The reversal of 81738594351 is 15349583718.

81738594351 is a `hidden beast` number, since 8 + 17 + 3 + 8 + 594 + 35 + 1 = 666.

It is not a de Polignac number, because 81738594351 - 2²⁶ = 81671485487 is a prime.

It is a super-2 number, since 2×81738594351² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81738594359) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 429930 + ... + 590183.

It is an arithmetic number, because the mean of its divisors is an integer number (5105670570).

Almost surely, 2^81738594351 is an apocalyptic number.

81738594351 is a deficient number, since it is larger than the sum of its proper divisors (40797499329).

81738594351 is a wasteful number, since it uses less digits than its factorization.

81738594351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020455 (or 1020452 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The spelling of 81738594351 in words is "eighty-one billion, seven hundred thirty-eight million, five hundred ninety-four thousand, three hundred fifty-one".