667795765 has 24 divisors (see below), whose sum is σ = 1003899960. Its totient is φ = 422690688.

The previous prime is 667795757. The next prime is 667795771. The reversal of 667795765 is 567597766.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 33108516 + 634687249 = 5754^2 + 25193^2 .

It is not a de Polignac number, because 667795765 - 2³ = 667795757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101650 + ... + 108019.

It is an arithmetic number, because the mean of its divisors is an integer number (41829165).

Almost surely, 2^667795765 is an apocalyptic number.

667795765 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

667795765 is a deficient number, since it is larger than the sum of its proper divisors (336104195).

667795765 is a wasteful number, since it uses less digits than its factorization.

667795765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209701 (or 209694 counting only the distinct ones).

The product of its digits is 16669800, while the sum is 58.

The square root of 667795765 is about 25841.7446198975. The cubic root of 667795765 is about 874.0733656975.

The spelling of 667795765 in words is "six hundred sixty-seven million, seven hundred ninety-five thousand, seven hundred sixty-five".