645635654337 has 16 divisors (see below), whose sum is σ = 884747761920. Its totient is φ = 418561851792.

The previous prime is 645635654297. The next prime is 645635654371. The reversal of 645635654337 is 733456536546.

It is a happy number.

It is not a de Polignac number, because 645635654337 - 2⁶ = 645635654273 is a prime.

It is a super-2 number, since 2×645635654337² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645635654137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10994787 + ... + 11053352.

It is an arithmetic number, because the mean of its divisors is an integer number (55296735120).

Almost surely, 2^645635654337 is an apocalyptic number.

It is an amenable number.

645635654337 is a deficient number, since it is larger than the sum of its proper divisors (239112107583).

645635654337 is a wasteful number, since it uses less digits than its factorization.

645635654337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22048412.

The product of its digits is 81648000, while the sum is 57.

The spelling of 645635654337 in words is "six hundred forty-five billion, six hundred thirty-five million, six hundred fifty-four thousand, three hundred thirty-seven".