64575352631 has 4 divisors (see below), whose sum is σ = 65949296352. Its totient is φ = 63201408912.

The previous prime is 64575352619. The next prime is 64575352661. The reversal of 64575352631 is 13625357546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13625357546 = 2 ⋅6812678773.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64575352631 is a prime.

It is a super-2 number, since 2×64575352631² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 1373943673 = 64575352631 / (6 + 4 + 5 + 7 + 5 + 3 + 5 + 2 + 6 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64575352661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 686971790 + ... + 686971883.

It is an arithmetic number, because the mean of its divisors is an integer number (16487324088).

Almost surely, 2^64575352631 is an apocalyptic number.

64575352631 is a deficient number, since it is larger than the sum of its proper divisors (1373943721).

64575352631 is a wasteful number, since it uses less digits than its factorization.

64575352631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373943720.

The product of its digits is 2268000, while the sum is 47.

The spelling of 64575352631 in words is "sixty-four billion, five hundred seventy-five million, three hundred fifty-two thousand, six hundred thirty-one".