660522055 has 4 divisors (see below), whose sum is σ = 792626472. Its totient is φ = 528417640.

The previous prime is 660522019. The next prime is 660522059. The reversal of 660522055 is 550225066.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-660522055 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 (660522059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66052201 + ... + 66052210.

It is an arithmetic number, because the mean of its divisors is an integer number (198156618).

Almost surely, 2^660522055 is an apocalyptic number.

660522055 is a deficient number, since it is larger than the sum of its proper divisors (132104417).

660522055 is a wasteful number, since it uses less digits than its factorization.

660522055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132104416.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 660522055 is about 25700.6236305659. The cubic root of 660522055 is about 870.8882701136. Note that the first 3 decimals are identical.

The spelling of 660522055 in words is "six hundred sixty million, five hundred twenty-two thousand, fifty-five".