64819645978383 has 80 divisors (see below), whose sum is σ = 102380212408320. Its totient is φ = 40786923456576.

The previous prime is 64819645978357. The next prime is 64819645978391. The reversal of 64819645978383 is 38387954691846.

64819645978383 is a `hidden beast` number, since 6 + 4 + 8 + 1 + 9 + 6 + 459 + 7 + 83 + 83 = 666.

It is not a de Polignac number, because 64819645978383 - 2⁶ = 64819645978319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64819645978393) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 127934610 + ... + 128440272.

It is an arithmetic number, because the mean of its divisors is an integer number (1279752655104).

Almost surely, 2^{64819645978383} is an apocalyptic number.

64819645978383 is a deficient number, since it is larger than the sum of its proper divisors (37560566429937).

64819645978383 is a wasteful number, since it uses less digits than its factorization.

64819645978383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506610 (or 506601 counting only the distinct ones).

The product of its digits is 7524679680, while the sum is 81.

The spelling of 64819645978383 in words is "sixty-four trillion, eight hundred nineteen billion, six hundred forty-five million, nine hundred seventy-eight thousand, three hundred eighty-three".