215530661056601 has 16 divisors (see below), whose sum is σ = 247706783605440. Its totient is φ = 185468897848320.

The previous prime is 215530661056483. The next prime is 215530661056657. The reversal of 215530661056601 is 106650166035512.

It is a cyclic number.

It is not a de Polignac number, because 215530661056601 - 2⁴² = 211132614545497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215530661056661) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 431958200 + ... + 432456873.

It is an arithmetic number, because the mean of its divisors is an integer number (15481673975340).

Almost surely, 2^{215530661056601} is an apocalyptic number.

It is an amenable number.

215530661056601 is a deficient number, since it is larger than the sum of its proper divisors (32176122548839).

215530661056601 is a wasteful number, since it uses less digits than its factorization.

215530661056601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864416296.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 215530661056601 in words is "two hundred fifteen trillion, five hundred thirty billion, six hundred sixty-one million, fifty-six thousand, six hundred one".