645607233040 has 160 divisors (see below), whose sum is σ = 1886160420864. Its totient is φ = 199643512320.

The previous prime is 645607233013. The next prime is 645607233053. The reversal of 645607233040 is 40332706546.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 645607232984 and 645607233002.

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, 369697 + ... + 1194943.

Almost surely, 2^645607233040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645607233040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (943080210432).

645607233040 is an abundant number, since it is smaller than the sum of its proper divisors (1240553187824).

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

645607233040 is a wasteful number, since it uses less digits than its factorization.

645607233040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825405 (or 825399 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 40.

Adding to 645607233040 its reverse (40332706546), we get a palindrome (685939939586).

The spelling of 645607233040 in words is "six hundred forty-five billion, six hundred seven million, two hundred thirty-three thousand, forty".