645886704365 has 16 divisors (see below), whose sum is σ = 894557658240. Its totient is φ = 438508651200.

The previous prime is 645886704361. The next prime is 645886704377. The reversal of 645886704365 is 563407688546.

It is a happy number.

It is not a de Polignac number, because 645886704365 - 2² = 645886704361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645886704298 and 645886704307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645886704361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91352435 + ... + 91359504.

It is an arithmetic number, because the mean of its divisors is an integer number (55909853640).

Almost surely, 2^645886704365 is an apocalyptic number.

It is an amenable number.

645886704365 is a deficient number, since it is larger than the sum of its proper divisors (248670953875).

645886704365 is a wasteful number, since it uses less digits than its factorization.

645886704365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182712052.

The product of its (nonzero) digits is 116121600, while the sum is 62.

The spelling of 645886704365 in words is "six hundred forty-five billion, eight hundred eighty-six million, seven hundred four thousand, three hundred sixty-five".