65944045831 has 4 divisors (see below), whose sum is σ = 65975615200. Its totient is φ = 65912476464.

The previous prime is 65944045793. The next prime is 65944045841. The reversal of 65944045831 is 13854044956.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65944045831 - 2²¹ = 65941948679 is a prime.

It is a super-2 number, since 2×65944045831² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65944045841) 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 3 ways as a sum of consecutive naturals, for example, 15781551 + ... + 15785728.

It is an arithmetic number, because the mean of its divisors is an integer number (16493903800).

Almost surely, 2^65944045831 is an apocalyptic number.

65944045831 is a deficient number, since it is larger than the sum of its proper divisors (31569369).

65944045831 is a wasteful number, since it uses less digits than its factorization.

65944045831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31569368.

The product of its (nonzero) digits is 2073600, while the sum is 49.

The spelling of 65944045831 in words is "sixty-five billion, nine hundred forty-four million, forty-five thousand, eight hundred thirty-one".