65765557 has 12 divisors (see below), whose sum is σ = 77850220. Its totient is φ = 55186560.

The previous prime is 65765543. The next prime is 65765561. The reversal of 65765557 is 75556756.

It can be written as a sum of positive squares in 2 ways, for example, as 14485636 + 51279921 = 3806^2 + 7161^2 .

It is not a de Polignac number, because 65765557 - 2¹⁵ = 65732789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65765597) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19332 + ... + 22477.

Almost surely, 2^65765557 is an apocalyptic number.

It is an amenable number.

65765557 is a deficient number, since it is larger than the sum of its proper divisors (12084663).

65765557 is a wasteful number, since it uses less digits than its factorization.

65765557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41844 (or 41833 counting only the distinct ones).

The product of its digits is 1102500, while the sum is 46.

The square root of 65765557 is about 8109.5965990917. The cubic root of 65765557 is about 403.6449290949.

The spelling of 65765557 in words is "sixty-five million, seven hundred sixty-five thousand, five hundred fifty-seven".