699689669 has 6 divisors (see below), whose sum is σ = 813924774. Its totient is φ = 599733960.

The previous prime is 699689663. The next prime is 699689701. The reversal of 699689669 is 966986996.

699689669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 620657569 + 79032100 = 24913^2 + 8890^2 .

It is not a de Polignac number, because 699689669 - 2⁸ = 699689413 is a prime.

It is a super-2 number, since 2×699689669² = 979131265810659122, which contains 22 as substring.

699689669 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 699689599 and 699689608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (699689663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7139642 + ... + 7139739.

It is an arithmetic number, because the mean of its divisors is an integer number (135654129).

Almost surely, 2^699689669 is an apocalyptic number.

It is an amenable number.

699689669 is a deficient number, since it is larger than the sum of its proper divisors (114235105).

699689669 is a wasteful number, since it uses less digits than its factorization.

699689669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14279395 (or 14279388 counting only the distinct ones).

The product of its digits is 68024448, while the sum is 68.

The square root of 699689669 is about 26451.6477558582. The cubic root of 699689669 is about 887.7727708541.

The spelling of 699689669 in words is "six hundred ninety-nine million, six hundred eighty-nine thousand, six hundred sixty-nine".