698979161556 has 288 divisors, whose sum is σ = 2141379152640. Its totient is φ = 189899624448.

The previous prime is 698979161549. The next prime is 698979161579. The reversal of 698979161556 is 655161979896.

698979161556 is a `hidden beast` number, since 6 + 9 + 8 + 9 + 7 + 9 + 1 + 61 + 556 = 666.

It is a super-2 number, since 2×698979161556² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15547446 + ... + 15592338.

It is an arithmetic number, because the mean of its divisors is an integer number (7435344280).

Almost surely, 2^698979161556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 698979161556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1070689576320).

698979161556 is an abundant number, since it is smaller than the sum of its proper divisors (1442399991084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

698979161556 is a wasteful number, since it uses less digits than its factorization.

698979161556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45055 (or 45050 counting only the distinct ones).

The product of its digits is 220449600, while the sum is 72.

The spelling of 698979161556 in words is "six hundred ninety-eight billion, nine hundred seventy-nine million, one hundred sixty-one thousand, five hundred fifty-six".