645287189290 has 16 divisors (see below), whose sum is σ = 1162073526912. Its totient is φ = 257991189904.

The previous prime is 645287189279. The next prime is 645287189297. The reversal of 645287189290 is 92981782546.

645287189290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (645287189297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15438814 + ... + 15480553.

It is an arithmetic number, because the mean of its divisors is an integer number (72629595432).

Almost surely, 2^645287189290 is an apocalyptic number.

645287189290 is a deficient number, since it is larger than the sum of its proper divisors (516786337622).

645287189290 is a wasteful number, since it uses less digits than its factorization.

645287189290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30921461.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 645287189290 in words is "six hundred forty-five billion, two hundred eighty-seven million, one hundred eighty-nine thousand, two hundred ninety".