215155067172061 has 8 divisors (see below), whose sum is σ = 215487456993720. Its totient is φ = 214822894107648.

The previous prime is 215155067172053. The next prime is 215155067172169. The reversal of 215155067172061 is 160271760551512.

It can be written as a sum of positive squares in 4 ways, for example, as 60658395722500 + 154496671449561 = 7788350^2 + 12429669^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215155067172061 - 2³ = 215155067172053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215155067171996 and 215155067172014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215155067176061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52202506 + ... + 56173051.

It is an arithmetic number, because the mean of its divisors is an integer number (26935932124215).

Almost surely, 2^{215155067172061} is an apocalyptic number.

It is an amenable number.

215155067172061 is a deficient number, since it is larger than the sum of its proper divisors (332389821659).

215155067172061 is a wasteful number, since it uses less digits than its factorization.

215155067172061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108378623.

The product of its (nonzero) digits is 882000, while the sum is 49.

The spelling of 215155067172061 in words is "two hundred fifteen trillion, one hundred fifty-five billion, sixty-seven million, one hundred seventy-two thousand, sixty-one".