65625531 has 16 divisors (see below), whose sum is σ = 90107424. Its totient is φ = 42453504.

The previous prime is 65625503. The next prime is 65625557. The reversal of 65625531 is 13552656.

It is not a de Polignac number, because 65625531 - 2²¹ = 63528379 is a prime.

It is a super-2 number, since 2×65625531² = 8613420638063922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65625492 and 65625501.

It is not an unprimeable number, because it can be changed into a prime (65625331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65325 + ... + 66321.

It is an arithmetic number, because the mean of its divisors is an integer number (5631714).

Almost surely, 2^65625531 is an apocalyptic number.

65625531 is a deficient number, since it is larger than the sum of its proper divisors (24481893).

65625531 is a wasteful number, since it uses less digits than its factorization.

65625531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630.

The product of its digits is 27000, while the sum is 33.

The square root of 65625531 is about 8100.9586469751. The cubic root of 65625531 is about 403.3582494151.

The spelling of 65625531 in words is "sixty-five million, six hundred twenty-five thousand, five hundred thirty-one".