623645707717 has 4 divisors (see below), whose sum is σ = 636914765376. Its totient is φ = 610376650060.

The previous prime is 623645707709. The next prime is 623645707739. The reversal of 623645707717 is 717707546326.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 623645707717 - 2³ = 623645707709 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 (623645707777) 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, 6634528759 + ... + 6634528852.

It is an arithmetic number, because the mean of its divisors is an integer number (159228691344).

Almost surely, 2^623645707717 is an apocalyptic number.

It is an amenable number.

623645707717 is a deficient number, since it is larger than the sum of its proper divisors (13269057659).

623645707717 is a wasteful number, since it uses less digits than its factorization.

623645707717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13269057658.

The product of its (nonzero) digits is 10372320, while the sum is 55.

The spelling of 623645707717 in words is "six hundred twenty-three billion, six hundred forty-five million, seven hundred seven thousand, seven hundred seventeen".