645236504423 has 6 divisors (see below), whose sum is σ = 750581239896. Its totient is φ = 553059860892.

The previous prime is 645236504417. The next prime is 645236504443. The reversal of 645236504423 is 324405632546.

It is not a de Polignac number, because 645236504423 - 2⁶ = 645236504359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645236504443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6584045915 + ... + 6584046012.

It is an arithmetic number, because the mean of its divisors is an integer number (125096873316).

Almost surely, 2^645236504423 is an apocalyptic number.

645236504423 is a deficient number, since it is larger than the sum of its proper divisors (105344735473).

645236504423 is a wasteful number, since it uses less digits than its factorization.

645236504423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13168091941 (or 13168091934 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 44.

The spelling of 645236504423 in words is "six hundred forty-five billion, two hundred thirty-six million, five hundred four thousand, four hundred twenty-three".