261215333155 has 16 divisors (see below), whose sum is σ = 363145546944. Its totient is φ = 176665397760.

The previous prime is 261215333147. The next prime is 261215333231. The reversal of 261215333155 is 551333512162.

It is not a de Polignac number, because 261215333155 - 2³ = 261215333147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51115906 + ... + 51121015.

It is an arithmetic number, because the mean of its divisors is an integer number (22696596684).

Almost surely, 2^261215333155 is an apocalyptic number.

261215333155 is a deficient number, since it is larger than the sum of its proper divisors (101930213789).

261215333155 is a wasteful number, since it uses less digits than its factorization.

261215333155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102237006.

The product of its digits is 81000, while the sum is 37.

The spelling of 261215333155 in words is "two hundred sixty-one billion, two hundred fifteen million, three hundred thirty-three thousand, one hundred fifty-five".