64381393945 has 16 divisors (see below), whose sum is σ = 84288859200. Its totient is φ = 46818520000.

The previous prime is 64381393939. The next prime is 64381393949. The reversal of 64381393945 is 54939318346.

It is not a de Polignac number, because 64381393945 - 2⁵ = 64381393913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (64381393949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 626031 + ... + 721579.

It is an arithmetic number, because the mean of its divisors is an integer number (5268053700).

Almost surely, 2^64381393945 is an apocalyptic number.

It is an amenable number.

64381393945 is a deficient number, since it is larger than the sum of its proper divisors (19907465255).

64381393945 is a wasteful number, since it uses less digits than its factorization.

64381393945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107816.

The product of its digits is 8398080, while the sum is 55.

The spelling of 64381393945 in words is "sixty-four billion, three hundred eighty-one million, three hundred ninety-three thousand, nine hundred forty-five".