690666055 has 32 divisors (see below), whose sum is σ = 941284800. Its totient is φ = 483305472.

The previous prime is 690666047. The next prime is 690666127. The reversal of 690666055 is 550666096.

690666055 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 690666055 - 2³ = 690666047 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81561 + ... + 89629.

It is an arithmetic number, because the mean of its divisors is an integer number (29415150).

Almost surely, 2^690666055 is an apocalyptic number.

690666055 is a deficient number, since it is larger than the sum of its proper divisors (250618745).

690666055 is a wasteful number, since it uses less digits than its factorization.

690666055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8163.

The product of its (nonzero) digits is 291600, while the sum is 43.

The square root of 690666055 is about 26280.5261553113. The cubic root of 690666055 is about 883.9398308624.

The spelling of 690666055 in words is "six hundred ninety million, six hundred sixty-six thousand, fifty-five".