261761411777217 has 32 divisors (see below), whose sum is σ = 381040810609536. Its totient is φ = 158519567270400.

The previous prime is 261761411777207. The next prime is 261761411777287. The reversal of 261761411777217 is 712777114167162.

It is not a de Polignac number, because 261761411777217 - 2²⁶ = 261761344668353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261761411777207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 945596367 + ... + 945873147.

It is an arithmetic number, because the mean of its divisors is an integer number (11907525331548).

Almost surely, 2^{261761411777217} is an apocalyptic number.

It is an amenable number.

261761411777217 is a deficient number, since it is larger than the sum of its proper divisors (119279398832319).

261761411777217 is a wasteful number, since it uses less digits than its factorization.

261761411777217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299041.

The product of its digits is 9680832, while the sum is 60.

The spelling of 261761411777217 in words is "two hundred sixty-one trillion, seven hundred sixty-one billion, four hundred eleven million, seven hundred seventy-seven thousand, two hundred seventeen".