645798990023 has 8 divisors (see below), whose sum is σ = 705624491136. Its totient is φ = 586159572600.

The previous prime is 645798990007. The next prime is 645798990037. The reversal of 645798990023 is 320099897546.

It is a happy number.

645798990023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645798990023 - 2⁴ = 645798990007 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 (645798990043) 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, 46513661 + ... + 46527542.

It is an arithmetic number, because the mean of its divisors is an integer number (88203061392).

Almost surely, 2^645798990023 is an apocalyptic number.

645798990023 is a deficient number, since it is larger than the sum of its proper divisors (59825501113).

645798990023 is a wasteful number, since it uses less digits than its factorization.

645798990023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93041845.

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 645798990023 in words is "six hundred forty-five billion, seven hundred ninety-eight million, nine hundred ninety thousand, twenty-three".