645195265154 has 12 divisors (see below), whose sum is σ = 1063772359062. Its totient is φ = 293270574960.

The previous prime is 645195265147. The next prime is 645195265189. The reversal of 645195265154 is 451562591546.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 488440243225 + 156755021929 = 698885^2 + 395923^2 .

It is a junction number, because it is equal to n+sod(n) for n = 645195265096 and 645195265105.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1333047827 + ... + 1333048310.

Almost surely, 2^645195265154 is an apocalyptic number.

645195265154 is a deficient number, since it is larger than the sum of its proper divisors (418577093908).

645195265154 is a wasteful number, since it uses less digits than its factorization.

645195265154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666096161 (or 2666096150 counting only the distinct ones).

The product of its digits is 6480000, while the sum is 53.

The spelling of 645195265154 in words is "six hundred forty-five billion, one hundred ninety-five million, two hundred sixty-five thousand, one hundred fifty-four".