65976545881 has 9 divisors (see below), whose sum is σ = 66245540799. Its totient is φ = 65708641944.

The previous prime is 65976545861. The next prime is 65976545933. The reversal of 65976545881 is 18854567956.

The square root of 65976545881 is 256859.

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

It can be written as a sum of positive squares in only one way, i.e., 44215575625 + 21760970256 = 210275^2 + 147516^2 .

It is not a de Polignac number, because 65976545881 - 2⁵ = 65976545849 is a prime.

It is a super-2 number, since 2×65976545881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65976545821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 101972700 + ... + 101973346.

Almost surely, 2^65976545881 is an apocalyptic number.

65976545881 is the 256859-th square number.

65976545881 is the 128430-th centered octagonal number.

It is an amenable number.

65976545881 is a deficient number, since it is larger than the sum of its proper divisors (268994918).

65976545881 is an frugal number, since it uses more digits than its factorization.

65976545881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088 (or 1044 counting only the distinct ones).

The product of its digits is 72576000, while the sum is 64.

Multiplying 65976545881 by its sum of digits (64), we get a square (4222498936384 = 2054872²).

The spelling of 65976545881 in words is "sixty-five billion, nine hundred seventy-six million, five hundred forty-five thousand, eight hundred eighty-one".