667760765 has 16 divisors (see below), whose sum is σ = 969656832. Its totient is φ = 430957824.

The previous prime is 667760741. The next prime is 667760767. The reversal of 667760765 is 567067766.

It is a cyclic number.

It is not a de Polignac number, because 667760765 - 2⁶ = 667760701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667760767) 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, 560549 + ... + 561738.

It is an arithmetic number, because the mean of its divisors is an integer number (60603552).

Almost surely, 2^667760765 is an apocalyptic number.

It is an amenable number.

667760765 is a deficient number, since it is larger than the sum of its proper divisors (301896067).

667760765 is a wasteful number, since it uses less digits than its factorization.

667760765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122316.

The product of its (nonzero) digits is 2222640, while the sum is 50.

The square root of 667760765 is about 25841.0674121639. The cubic root of 667760765 is about 874.0580950095.

The spelling of 667760765 in words is "six hundred sixty-seven million, seven hundred sixty thousand, seven hundred sixty-five".