698877608121 has 225 divisors, whose sum is σ = 1323575590805. Its totient is φ = 355328764560.

The previous prime is 698877608087. The next prime is 698877608131. The reversal of 698877608121 is 121806778896.

The square root of 698877608121 is 835989.

It is a perfect power (a square), and thus also a powerful number.

698877608121 is a `hidden beast` number, since 6 + 9 + 8 + 8 + 7 + 7 + 608 + 12 + 1 = 666.

It is not a de Polignac number, because 698877608121 - 2¹¹ = 698877606073 is a prime.

It is a super-2 number, since 2×698877608121² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (698877608131) by changing a digit.

It is a polite number, since it can be written in 224 ways as a sum of consecutive naturals, for example, 14869736320 + ... + 14869736366.

Almost surely, 2^698877608121 is an apocalyptic number.

698877608121 is the 835989-th square number.

698877608121 is the 417995-th centered octagonal number.

It is an amenable number.

698877608121 is a deficient number, since it is larger than the sum of its proper divisors (624697982684).

698877608121 is an frugal number, since it uses more digits than its factorization.

698877608121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 63.

The spelling of 698877608121 in words is "six hundred ninety-eight billion, eight hundred seventy-seven million, six hundred eight thousand, one hundred twenty-one".