645112645523 has 4 divisors (see below), whose sum is σ = 645114777000. Its totient is φ = 645110514048.

The previous prime is 645112645511. The next prime is 645112645537. The reversal of 645112645523 is 325546211546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645112645523 - 2⁸ = 645112645267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645112645553) 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, 517865 + ... + 1248362.

It is an arithmetic number, because the mean of its divisors is an integer number (161278694250).

Almost surely, 2^645112645523 is an apocalyptic number.

645112645523 is a deficient number, since it is larger than the sum of its proper divisors (2131477).

645112645523 is a wasteful number, since it uses less digits than its factorization.

645112645523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131476.

The product of its digits is 864000, while the sum is 44.

The spelling of 645112645523 in words is "six hundred forty-five billion, one hundred twelve million, six hundred forty-five thousand, five hundred twenty-three".