6698966556825 has 120 divisors (see below), whose sum is σ = 12650540258048. Its totient is φ = 3503658913920.

The previous prime is 6698966556809. The next prime is 6698966556829. The reversal of 6698966556825 is 5286556698966.

It is not a de Polignac number, because 6698966556825 - 2⁴ = 6698966556809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6698966556829) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 30144819 + ... + 30366231.

Almost surely, 2^{6698966556825} is an apocalyptic number.

It is an amenable number.

6698966556825 is a deficient number, since it is larger than the sum of its proper divisors (5951573701223).

6698966556825 is a wasteful number, since it uses less digits than its factorization.

6698966556825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221725 (or 221711 counting only the distinct ones).

The product of its digits is 10077696000, while the sum is 81.

The spelling of 6698966556825 in words is "six trillion, six hundred ninety-eight billion, nine hundred sixty-six million, five hundred fifty-six thousand, eight hundred twenty-five".