645110054464 has 14 divisors (see below), whose sum is σ = 1280140264454. Its totient is φ = 322555027200.

The previous prime is 645110054447. The next prime is 645110054473. The reversal of 645110054464 is 464450011546.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 331554852864 + 313555201600 = 575808^2 + 559960^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5039922237 + ... + 5039922364.

Almost surely, 2^645110054464 is an apocalyptic number.

645110054464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

645110054464 is a deficient number, since it is larger than the sum of its proper divisors (635030209990).

645110054464 is a wasteful number, since it uses less digits than its factorization.

645110054464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10079844613 (or 10079844603 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 645110054464 in words is "six hundred forty-five billion, one hundred ten million, fifty-four thousand, four hundred sixty-four".