645454400226 has 16 divisors (see below), whose sum is σ = 1303690076928. Its totient is φ = 213021254000.

The previous prime is 645454400179. The next prime is 645454400231. The reversal of 645454400226 is 622004454546.

It is a super-2 number, since 2×645454400226² (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, 532552530 + ... + 532553741.

It is an arithmetic number, because the mean of its divisors is an integer number (81480629808).

Almost surely, 2^645454400226 is an apocalyptic number.

645454400226 is an abundant number, since it is smaller than the sum of its proper divisors (658235676702).

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

645454400226 is a wasteful number, since it uses less digits than its factorization.

645454400226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065106377.

The product of its (nonzero) digits is 921600, while the sum is 42.

The spelling of 645454400226 in words is "six hundred forty-five billion, four hundred fifty-four million, four hundred thousand, two hundred twenty-six".