659797978 has 16 divisors (see below), whose sum is σ = 1131563520. Its totient is φ = 282650256.

The previous prime is 659797961. The next prime is 659797981. The reversal of 659797978 is 879797956.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29400 + ... + 46732.

It is an arithmetic number, because the mean of its divisors is an integer number (70722720).

Almost surely, 2^659797978 is an apocalyptic number.

659797978 is a deficient number, since it is larger than the sum of its proper divisors (471765542).

659797978 is a wasteful number, since it uses less digits than its factorization.

659797978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20061.

The product of its digits is 60011280, while the sum is 67.

The square root of 659797978 is about 25686.5330085631. The cubic root of 659797978 is about 870.5699255944.

The spelling of 659797978 in words is "six hundred fifty-nine million, seven hundred ninety-seven thousand, nine hundred seventy-eight".