660620015555 has 64 divisors (see below), whose sum is σ = 868602538368. Its totient is φ = 480305479680.

The previous prime is 660620015513. The next prime is 660620015569. The reversal of 660620015555 is 555510026066.

It is not a de Polignac number, because 660620015555 - 2¹⁶ = 660619950019 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 317452115 + ... + 317454195.

It is an arithmetic number, because the mean of its divisors is an integer number (13571914662).

Almost surely, 2^660620015555 is an apocalyptic number.

660620015555 is a deficient number, since it is larger than the sum of its proper divisors (207982522813).

660620015555 is a wasteful number, since it uses less digits than its factorization.

660620015555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2856.

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

The spelling of 660620015555 in words is "six hundred sixty billion, six hundred twenty million, fifteen thousand, five hundred fifty-five".