659618289981 has 24 divisors (see below), whose sum is σ = 1097467664384. Its totient is φ = 373956821280.

The previous prime is 659618289937. The next prime is 659618290007. The reversal of 659618289981 is 189982816956.

659618289981 is a `hidden beast` number, since 6 + 596 + 1 + 8 + 28 + 9 + 9 + 8 + 1 = 666.

It is not a de Polignac number, because 659618289981 - 2¹³ = 659618281789 is a prime.

It is a super-2 number, since 2×659618289981² (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 (659618289931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41212990 + ... + 41228991.

Almost surely, 2^659618289981 is an apocalyptic number.

It is an amenable number.

659618289981 is a deficient number, since it is larger than the sum of its proper divisors (437849374403).

659618289981 is a wasteful number, since it uses less digits than its factorization.

659618289981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82442121 (or 82442118 counting only the distinct ones).

The product of its digits is 134369280, while the sum is 72.

The spelling of 659618289981 in words is "six hundred fifty-nine billion, six hundred eighteen million, two hundred eighty-nine thousand, nine hundred eighty-one".