659221619878 has 16 divisors (see below), whose sum is σ = 1022259767760. Its totient is φ = 318626413056.

The previous prime is 659221619873. The next prime is 659221619891. The reversal of 659221619878 is 878916122956.

It is a happy number.

It is a super-2 number, since 2×659221619878² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659221619873) 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, 39503863 + ... + 39520546.

It is an arithmetic number, because the mean of its divisors is an integer number (63891235485).

Almost surely, 2^659221619878 is an apocalyptic number.

659221619878 is a deficient number, since it is larger than the sum of its proper divisors (363038147882).

659221619878 is a wasteful number, since it uses less digits than its factorization.

659221619878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79024551.

The product of its digits is 26127360, while the sum is 64.

The spelling of 659221619878 in words is "six hundred fifty-nine billion, two hundred twenty-one million, six hundred nineteen thousand, eight hundred seventy-eight".