65695521 has 16 divisors (see below), whose sum is σ = 96215040. Its totient is φ = 39687120.

The previous prime is 65695517. The next prime is 65695523. The reversal of 65695521 is 12559656.

It is not a de Polignac number, because 65695521 - 2² = 65695517 is a prime.

It is a super-2 number, since 2×65695521² = 8631802958922882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65695521.

It is not an unprimeable number, because it can be changed into a prime (65695523) 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, 23745 + ... + 26366.

It is an arithmetic number, because the mean of its divisors is an integer number (6013440).

Almost surely, 2^65695521 is an apocalyptic number.

It is an amenable number.

65695521 is a deficient number, since it is larger than the sum of its proper divisors (30519519).

65695521 is a wasteful number, since it uses less digits than its factorization.

65695521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50156.

The product of its digits is 81000, while the sum is 39.

The square root of 65695521 is about 8105.2773549090. The cubic root of 65695521 is about 403.5015930864.

It can be divided in two parts, 6569 and 5521, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 65695521 in words is "sixty-five million, six hundred ninety-five thousand, five hundred twenty-one".