261451115252747 has 16 divisors (see below), whose sum is σ = 309032040904704. Its totient is φ = 216455631912000.

The previous prime is 261451115252713. The next prime is 261451115252779. The reversal of 261451115252747 is 747252511154162.

It is a cyclic number.

It is not a de Polignac number, because 261451115252747 - 2²⁰ = 261451114204171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261451115252347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1156167029 + ... + 1156393142.

It is an arithmetic number, because the mean of its divisors is an integer number (19314502556544).

Almost surely, 2^{261451115252747} is an apocalyptic number.

261451115252747 is a deficient number, since it is larger than the sum of its proper divisors (47580925651957).

261451115252747 is a wasteful number, since it uses less digits than its factorization.

261451115252747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312560730.

The product of its digits is 4704000, while the sum is 53.

The spelling of 261451115252747 in words is "two hundred sixty-one trillion, four hundred fifty-one billion, one hundred fifteen million, two hundred fifty-two thousand, seven hundred forty-seven".