261656241306215 has 32 divisors (see below), whose sum is σ = 366493325635584. Its totient is φ = 175596505868160.

The previous prime is 261656241306197. The next prime is 261656241306223. The reversal of 261656241306215 is 512603142656162.

It is not a de Polignac number, because 261656241306215 - 2⁸ = 261656241305959 is a prime.

It is a super-2 number, since 2×261656241306215² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35607545 + ... + 42322685.

It is an arithmetic number, because the mean of its divisors is an integer number (11452916426112).

Almost surely, 2^{261656241306215} is an apocalyptic number.

261656241306215 is a deficient number, since it is larger than the sum of its proper divisors (104837084329369).

261656241306215 is a wasteful number, since it uses less digits than its factorization.

261656241306215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6738887.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 261656241306215 in words is "two hundred sixty-one trillion, six hundred fifty-six billion, two hundred forty-one million, three hundred six thousand, two hundred fifteen".