645323621154 has 16 divisors (see below), whose sum is σ = 1290787930560. Its totient is φ = 215084425680.

The previous prime is 645323621077. The next prime is 645323621167. The reversal of 645323621154 is 451126323546.

It is a super-2 number, since 2×645323621154² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5802334 + ... + 5912505.

It is an arithmetic number, because the mean of its divisors is an integer number (80674245660).

Almost surely, 2^645323621154 is an apocalyptic number.

645323621154 is an abundant number, since it is smaller than the sum of its proper divisors (645464309406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645323621154 is a wasteful number, since it uses less digits than its factorization.

645323621154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11724025.

The product of its digits is 518400, while the sum is 42.

The spelling of 645323621154 in words is "six hundred forty-five billion, three hundred twenty-three million, six hundred twenty-one thousand, one hundred fifty-four".