645510121422 has 64 divisors (see below), whose sum is σ = 1307485670400. Its totient is φ = 212445763200.

The previous prime is 645510121393. The next prime is 645510121453. The reversal of 645510121422 is 224121015546.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 331199704 + ... + 331201652.

It is an arithmetic number, because the mean of its divisors is an integer number (20429463600).

Almost surely, 2^645510121422 is an apocalyptic number.

645510121422 is an abundant number, since it is smaller than the sum of its proper divisors (661975548978).

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

645510121422 is a wasteful number, since it uses less digits than its factorization.

645510121422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4169.

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 645510121422 its reverse (224121015546), we get a palindrome (869631136968).

The spelling of 645510121422 in words is "six hundred forty-five billion, five hundred ten million, one hundred twenty-one thousand, four hundred twenty-two".