766660655 has 16 divisors (see below), whose sum is σ = 927754560. Its totient is φ = 608176128.

The previous prime is 766660651. The next prime is 766660669. The reversal of 766660655 is 556066667.

766660655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 766660655 - 2² = 766660651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766660651) 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, 345329 + ... + 347541.

It is an arithmetic number, because the mean of its divisors is an integer number (57984660).

Almost surely, 2^766660655 is an apocalyptic number.

766660655 is a deficient number, since it is larger than the sum of its proper divisors (161093905).

766660655 is a wasteful number, since it uses less digits than its factorization.

766660655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2770.

The product of its (nonzero) digits is 1360800, while the sum is 47.

The square root of 766660655 is about 27688.6376515711. The cubic root of 766660655 is about 915.2387345247.

The spelling of 766660655 in words is "seven hundred sixty-six million, six hundred sixty thousand, six hundred fifty-five".