645877594368 has 144 divisors (see below), whose sum is σ = 1928519232640. Its totient is φ = 213202077696.

The previous prime is 645877594309. The next prime is 645877594387. The reversal of 645877594368 is 863495778546.

645877594368 is a `hidden beast` number, since 6 + 4 + 587 + 7 + 5 + 9 + 4 + 36 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 645877594296 and 645877594305.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 258330 + ... + 1165542.

Almost surely, 2^645877594368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645877594368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964259616320).

645877594368 is an abundant number, since it is smaller than the sum of its proper divisors (1282641638272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645877594368 is a wasteful number, since it uses less digits than its factorization.

645877594368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907341 (or 907321 counting only the distinct ones).

The product of its digits is 1219276800, while the sum is 72.

The spelling of 645877594368 in words is "six hundred forty-five billion, eight hundred seventy-seven million, five hundred ninety-four thousand, three hundred sixty-eight".