660615025055 has 32 divisors (see below), whose sum is σ = 850377528000. Its totient is φ = 491130611712.

The previous prime is 660615025051. The next prime is 660615025061. The reversal of 660615025055 is 550520516066.

It is a cyclic number.

It is not a de Polignac number, because 660615025055 - 2² = 660615025051 is a prime.

It is a super-2 number, since 2×660615025055² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660615025051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33105221 + ... + 33125169.

It is an arithmetic number, because the mean of its divisors is an integer number (26574297750).

Almost surely, 2^660615025055 is an apocalyptic number.

660615025055 is a deficient number, since it is larger than the sum of its proper divisors (189762502945).

660615025055 is a wasteful number, since it uses less digits than its factorization.

660615025055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26603.

The product of its (nonzero) digits is 270000, while the sum is 41.

The spelling of 660615025055 in words is "six hundred sixty billion, six hundred fifteen million, twenty-five thousand, fifty-five".