81490735725 has 48 divisors (see below), whose sum is σ = 154090137600. Its totient is φ = 37225944000.

The previous prime is 81490735717. The next prime is 81490735757. The reversal of 81490735725 is 52753709418.

It is not a de Polignac number, because 81490735725 - 2³ = 81490735717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 679000 + ... + 789950.

It is an arithmetic number, because the mean of its divisors is an integer number (3210211200).

Almost surely, 2^81490735725 is an apocalyptic number.

It is an amenable number.

81490735725 is a deficient number, since it is larger than the sum of its proper divisors (72599401875).

81490735725 is a wasteful number, since it uses less digits than its factorization.

81490735725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112370 (or 112365 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 51.

The spelling of 81490735725 in words is "eighty-one billion, four hundred ninety million, seven hundred thirty-five thousand, seven hundred twenty-five".