718863669 has 6 divisors (see below), whose sum is σ = 1038358646. Its totient is φ = 479242440.

The previous prime is 718863661. The next prime is 718863709. The reversal of 718863669 is 966368817.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 691427025 + 27436644 = 26295^2 + 5238^2 .

It is not a de Polignac number, because 718863669 - 2³ = 718863661 is a prime.

It is a super-2 number, since 2×718863669² = 1033529949216283122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718863661) 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, 39936862 + ... + 39936879.

Almost surely, 2^718863669 is an apocalyptic number.

It is an amenable number.

718863669 is a deficient number, since it is larger than the sum of its proper divisors (319494977).

718863669 is a wasteful number, since it uses less digits than its factorization.

718863669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79873747 (or 79873744 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 718863669 is about 26811.6330908805. The cubic root of 718863669 is about 895.8091863047.

The spelling of 718863669 in words is "seven hundred eighteen million, eight hundred sixty-three thousand, six hundred sixty-nine".