64381393751 has 8 divisors (see below), whose sum is σ = 64892433408. Its totient is φ = 63870651000.

The previous prime is 64381393721. The next prime is 64381393757. The reversal of 64381393751 is 15739318346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64381393751 - 2²⁶ = 64314284887 is a prime.

It is a super-2 number, since 2×64381393751² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64381393751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64381393757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371756 + ... + 516686.

It is an arithmetic number, because the mean of its divisors is an integer number (8111554176).

Almost surely, 2^64381393751 is an apocalyptic number.

64381393751 is a deficient number, since it is larger than the sum of its proper divisors (511039657).

64381393751 is a wasteful number, since it uses less digits than its factorization.

64381393751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148453.

The product of its digits is 1632960, while the sum is 50.

The spelling of 64381393751 in words is "sixty-four billion, three hundred eighty-one million, three hundred ninety-three thousand, seven hundred fifty-one".