659957779 has 4 divisors (see below), whose sum is σ = 710723776. Its totient is φ = 609191784.

The previous prime is 659957777. The next prime is 659957797. The reversal of 659957779 is 977759956.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 659957779 - 2¹ = 659957777 is a prime.

It is a super-2 number, since 2×659957779² = 871088540125225682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 659957779.

It is not an unprimeable number, because it can be changed into a prime (659957777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25382979 + ... + 25383004.

It is an arithmetic number, because the mean of its divisors is an integer number (177680944).

Almost surely, 2^659957779 is an apocalyptic number.

659957779 is a deficient number, since it is larger than the sum of its proper divisors (50765997).

659957779 is a wasteful number, since it uses less digits than its factorization.

659957779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50765996.

The product of its digits is 37507050, while the sum is 64.

The square root of 659957779 is about 25689.6434190901. The cubic root of 659957779 is about 870.6402030225.

The spelling of 659957779 in words is "six hundred fifty-nine million, nine hundred fifty-seven thousand, seven hundred seventy-nine".