645621233334 has 64 divisors (see below), whose sum is σ = 1615355481600. Its totient is φ = 167121457920.

The previous prime is 645621233333. The next prime is 645621233359. The reversal of 645621233334 is 433332126546.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645621233333) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2249359 + ... + 2520090.

It is an arithmetic number, because the mean of its divisors is an integer number (25239929400).

Almost surely, 2^645621233334 is an apocalyptic number.

645621233334 is an abundant number, since it is smaller than the sum of its proper divisors (969734248266).

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

645621233334 is a wasteful number, since it uses less digits than its factorization.

645621233334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4769765.

The product of its digits is 933120, while the sum is 42.

The spelling of 645621233334 in words is "six hundred forty-five billion, six hundred twenty-one million, two hundred thirty-three thousand, three hundred thirty-four".