806538705625 has 15 divisors (see below), whose sum is σ = 1007878823193. Its totient is φ = 645213003000.

The previous prime is 806538705617. The next prime is 806538705629. The reversal of 806538705625 is 526507835608.

The square root of 806538705625 is 898075.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 63232634521 + 743306071104 = 251461^2 + 862152^2 .

It is not a de Polignac number, because 806538705625 - 2³ = 806538705617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (806538705629) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 22433914 + ... + 22469836.

Almost surely, 2^806538705625 is an apocalyptic number.

806538705625 is the 898075-th square number.

806538705625 is the 449038-th centered octagonal number.

It is an amenable number.

806538705625 is a deficient number, since it is larger than the sum of its proper divisors (201340117568).

806538705625 is an frugal number, since it uses more digits than its factorization.

806538705625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71866 (or 35928 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 55.

The spelling of 806538705625 in words is "eight hundred six billion, five hundred thirty-eight million, seven hundred five thousand, six hundred twenty-five".