645444043076 has 48 divisors (see below), whose sum is σ = 1347323725440. Its totient is φ = 264780122880.

The previous prime is 645444043061. The next prime is 645444043091. The reversal of 645444043076 is 670340444546.

It is an interprime number because it is at equal distance from previous prime (645444043061) and next prime (645444043091).

It is a self number, because there is not a number n which added to its sum of digits gives 645444043076.

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, 5243246 + ... + 5364933.

It is an arithmetic number, because the mean of its divisors is an integer number (28069244280).

Almost surely, 2^645444043076 is an apocalyptic number.

It is an amenable number.

645444043076 is an abundant number, since it is smaller than the sum of its proper divisors (701879682364).

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

645444043076 is a wasteful number, since it uses less digits than its factorization.

645444043076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10608284 (or 10608282 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 47.

The spelling of 645444043076 in words is "six hundred forty-five billion, four hundred forty-four million, forty-three thousand, seventy-six".