813866669 has 16 divisors (see below), whose sum is σ = 1017962880. Its totient is φ = 632136960.

The previous prime is 813866659. The next prime is 813866693. The reversal of 813866669 is 966668318.

It is not a de Polignac number, because 813866669 - 2¹⁶ = 813801133 is a prime.

It is a super-2 number, since 2×813866669² = 1324757909818311122, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 813866669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813866609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7217 + ... + 40985.

It is an arithmetic number, because the mean of its divisors is an integer number (63622680).

Almost surely, 2^813866669 is an apocalyptic number.

It is an amenable number.

813866669 is a deficient number, since it is larger than the sum of its proper divisors (204096211).

813866669 is a wasteful number, since it uses less digits than its factorization.

813866669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34100.

The product of its digits is 2239488, while the sum is 53.

The square root of 813866669 is about 28528.3485151174. The cubic root of 813866669 is about 933.6506866245.

The spelling of 813866669 in words is "eight hundred thirteen million, eight hundred sixty-six thousand, six hundred sixty-nine".