660779055 has 48 divisors (see below), whose sum is σ = 1226160000. Its totient is φ = 328183488.

The previous prime is 660779051. The next prime is 660779081. The reversal of 660779055 is 550977066.

It is a happy number.

660779055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 660779055 - 2² = 660779051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 660779055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660779051) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43896 + ... + 56994.

It is an arithmetic number, because the mean of its divisors is an integer number (25545000).

Almost surely, 2^660779055 is an apocalyptic number.

660779055 is a deficient number, since it is larger than the sum of its proper divisors (565380945).

660779055 is a wasteful number, since it uses less digits than its factorization.

660779055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13188 (or 13185 counting only the distinct ones).

The product of its (nonzero) digits is 396900, while the sum is 45.

The square root of 660779055 is about 25705.6230229886. The cubic root of 660779055 is about 871.0012056630.

The spelling of 660779055 in words is "six hundred sixty million, seven hundred seventy-nine thousand, fifty-five".