261466617 has 32 divisors (see below), whose sum is σ = 371531776. Its totient is φ = 163296000.

The previous prime is 261466607. The next prime is 261466631. The reversal of 261466617 is 716664162.

It is not a de Polignac number, because 261466617 - 2⁷ = 261466489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261466607) 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, 603633 + ... + 604065.

It is an arithmetic number, because the mean of its divisors is an integer number (11610368).

Almost surely, 2^261466617 is an apocalyptic number.

It is an amenable number.

261466617 is a deficient number, since it is larger than the sum of its proper divisors (110065159).

261466617 is a wasteful number, since it uses less digits than its factorization.

261466617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661.

The product of its digits is 72576, while the sum is 39.

The square root of 261466617 is about 16169.9294061539. The cubic root of 261466617 is about 639.4482688036.

The spelling of 261466617 in words is "two hundred sixty-one million, four hundred sixty-six thousand, six hundred seventeen".