261650434244461 has 16 divisors (see below), whose sum is σ = 270202740111360. Its totient is φ = 253105145083440.

The previous prime is 261650434244447. The next prime is 261650434244497. The reversal of 261650434244461 is 164442434056162.

It is a cyclic number.

It is not a de Polignac number, because 261650434244461 - 2²³ = 261650425855853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261650434244399 and 261650434244408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261650434244411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 875465710 + ... + 875764528.

It is an arithmetic number, because the mean of its divisors is an integer number (16887671256960).

Almost surely, 2^{261650434244461} is an apocalyptic number.

It is an amenable number.

261650434244461 is a deficient number, since it is larger than the sum of its proper divisors (8552305866899).

261650434244461 is a wasteful number, since it uses less digits than its factorization.

261650434244461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310464.

The product of its (nonzero) digits is 13271040, while the sum is 52.

The spelling of 261650434244461 in words is "two hundred sixty-one trillion, six hundred fifty billion, four hundred thirty-four million, two hundred forty-four thousand, four hundred sixty-one".