261216761015 has 8 divisors (see below), whose sum is σ = 358240129440. Its totient is φ = 179120064672.

The previous prime is 261216760997. The next prime is 261216761021. The reversal of 261216761015 is 510167612162.

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 261216761015 - 2¹⁸ = 261216498871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261216761015.

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, 3731667980 + ... + 3731668049.

It is an arithmetic number, because the mean of its divisors is an integer number (44780016180).

Almost surely, 2^261216761015 is an apocalyptic number.

261216761015 is a deficient number, since it is larger than the sum of its proper divisors (97023368425).

261216761015 is an equidigital number, since it uses as much as digits as its factorization.

261216761015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7463336041.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 261216761015 in words is "two hundred sixty-one billion, two hundred sixteen million, seven hundred sixty-one thousand, fifteen".