65511457 has 6 divisors (see below), whose sum is σ = 72008594. Its totient is φ = 59555760.

The previous prime is 65511451. The next prime is 65511469. The reversal of 65511457 is 75411556.

It can be written as a sum of positive squares in only one way, i.e., 64657681 + 853776 = 8041^2 + 924^2 .

It is not a de Polignac number, because 65511457 - 2¹⁵ = 65478689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65511451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 270588 + ... + 270829.

Almost surely, 2^65511457 is an apocalyptic number.

It is an amenable number.

65511457 is a deficient number, since it is larger than the sum of its proper divisors (6497137).

65511457 is a wasteful number, since it uses less digits than its factorization.

65511457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541439 (or 541428 counting only the distinct ones).

The product of its digits is 21000, while the sum is 34.

The square root of 65511457 is about 8093.9148129938. The cubic root of 65511457 is about 403.1244005119.

Subtracting 65511457 from its reverse (75411556), we obtain a palindrome (9900099).

It can be divided in two parts, 6551 and 1457, that added together give a palindrome (8008).

The spelling of 65511457 in words is "sixty-five million, five hundred eleven thousand, four hundred fifty-seven".