645553122 has 8 divisors (see below), whose sum is σ = 1291106256. Its totient is φ = 215184372.

The previous prime is 645553099. The next prime is 645553123. The reversal of 645553122 is 221355546.

It is a sphenic number, since it is the product of 3 distinct primes.

645553122 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (645553123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53796088 + ... + 53796099.

It is an arithmetic number, because the mean of its divisors is an integer number (161388282).

Almost surely, 2^645553122 is an apocalyptic number.

645553122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

645553122 is a wasteful number, since it uses less digits than its factorization.

645553122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107592192.

The product of its digits is 36000, while the sum is 33.

The square root of 645553122 is about 25407.7374435427. The cubic root of 645553122 is about 864.2591681147.

The spelling of 645553122 in words is "six hundred forty-five million, five hundred fifty-three thousand, one hundred twenty-two".