645534323516 has 12 divisors (see below), whose sum is σ = 1129702799232. Its totient is φ = 322762095168.

The previous prime is 645534323507. The next prime is 645534323519. The reversal of 645534323516 is 615323435546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645534323519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 972380 + ... + 1495523.

It is an arithmetic number, because the mean of its divisors is an integer number (94141899936).

Almost surely, 2^645534323516 is an apocalyptic number.

It is an amenable number.

645534323516 is a deficient number, since it is larger than the sum of its proper divisors (484168475716).

645534323516 is a wasteful number, since it uses less digits than its factorization.

645534323516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2533300 (or 2533298 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 47.

The spelling of 645534323516 in words is "six hundred forty-five billion, five hundred thirty-four million, three hundred twenty-three thousand, five hundred sixteen".