645415010444 has 24 divisors (see below), whose sum is σ = 1189195874160. Its totient is φ = 305652574656.

The previous prime is 645415010437. The next prime is 645415010453. The reversal of 645415010444 is 444010514546.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 645415010398 and 645415010407.

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 7 ways as a sum of consecutive naturals, for example, 643427 + ... + 1305690.

It is an arithmetic number, because the mean of its divisors is an integer number (49549828090).

Almost surely, 2^645415010444 is an apocalyptic number.

It is an amenable number.

645415010444 is a deficient number, since it is larger than the sum of its proper divisors (543780863716).

645415010444 is a wasteful number, since it uses less digits than its factorization.

645415010444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953497 (or 1953495 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 38.

The spelling of 645415010444 in words is "six hundred forty-five billion, four hundred fifteen million, ten thousand, four hundred forty-four".