659685023 has 4 divisors (see below), whose sum is σ = 659744928. Its totient is φ = 659625120.

The previous prime is 659684981. The next prime is 659685029. The reversal of 659685023 is 320586956.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 659685023 - 2¹² = 659680927 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 (659685029) 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, 8138 + ... + 37223.

It is an arithmetic number, because the mean of its divisors is an integer number (164936232).

Almost surely, 2^659685023 is an apocalyptic number.

659685023 is a deficient number, since it is larger than the sum of its proper divisors (59905).

659685023 is a wasteful number, since it uses less digits than its factorization.

659685023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59904.

The product of its (nonzero) digits is 388800, while the sum is 44.

The square root of 659685023 is about 25684.3341942126. The cubic root of 659685023 is about 870.5202432971.

It can be divided in two parts, 6596 and 85023, that added together give a palindrome (91619).

The spelling of 659685023 in words is "six hundred fifty-nine million, six hundred eighty-five thousand, twenty-three".