659988797 has 8 divisors (see below), whose sum is σ = 711057144. Its totient is φ = 608963328.

The previous prime is 659988781. The next prime is 659988803. The reversal of 659988797 is 797889956.

It can be written as a sum of positive squares in 4 ways, for example, as 266799556 + 393189241 = 16334^2 + 19829^2 .

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 659988797 - 2⁴ = 659988781 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 (659988727) 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, 25913 + ... + 44625.

It is an arithmetic number, because the mean of its divisors is an integer number (88882143).

Almost surely, 2^659988797 is an apocalyptic number.

It is an amenable number.

659988797 is a deficient number, since it is larger than the sum of its proper divisors (51068347).

659988797 is a wasteful number, since it uses less digits than its factorization.

659988797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21439.

The product of its digits is 68584320, while the sum is 68.

The square root of 659988797 is about 25690.2471183132. The cubic root of 659988797 is about 870.6538428318.

The spelling of 659988797 in words is "six hundred fifty-nine million, nine hundred eighty-eight thousand, seven hundred ninety-seven".