645545655133136 has 20 divisors (see below), whose sum is σ = 1250782165395264. Its totient is φ = 322763160837600.

The previous prime is 645545655133129. The next prime is 645545655133147. The reversal of 645545655133136 is 631331556545546.

It is a super-2 number, since 2×645545655133136² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 603619610 + ... + 604688121.

Almost surely, 2^{645545655133136} is an apocalyptic number.

It is an amenable number.

645545655133136 is a deficient number, since it is larger than the sum of its proper divisors (605236510262128).

645545655133136 is a wasteful number, since it uses less digits than its factorization.

645545655133136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208341130 (or 1208341124 counting only the distinct ones).

The product of its digits is 291600000, while the sum is 62.

The spelling of 645545655133136 in words is "six hundred forty-five trillion, five hundred forty-five billion, six hundred fifty-five million, one hundred thirty-three thousand, one hundred thirty-six".