261564252261215 has 8 divisors (see below), whose sum is σ = 316168176456720. Its totient is φ = 207724019313472.

The previous prime is 261564252261209. The next prime is 261564252261223. The reversal of 261564252261215 is 512162252465162.

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 261564252261215 - 2²² = 261564248066911 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190922811185 + ... + 190922812554.

It is an arithmetic number, because the mean of its divisors is an integer number (39521022057090).

Almost surely, 2^{261564252261215} is an apocalyptic number.

261564252261215 is a deficient number, since it is larger than the sum of its proper divisors (54603924195505).

261564252261215 is a wasteful number, since it uses less digits than its factorization.

261564252261215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381845623881.

The product of its digits is 3456000, while the sum is 50.

The spelling of 261564252261215 in words is "two hundred sixty-one trillion, five hundred sixty-four billion, two hundred fifty-two million, two hundred sixty-one thousand, two hundred fifteen".