261011084951 has 4 divisors (see below), whose sum is σ = 261939950304. Its totient is φ = 260082219600.

The previous prime is 261011084941. The next prime is 261011084963. The reversal of 261011084951 is 159480110162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261011084951 - 2²² = 261006890647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261011084941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464432255 + ... + 464432816.

It is an arithmetic number, because the mean of its divisors is an integer number (65484987576).

Almost surely, 2^261011084951 is an apocalyptic number.

261011084951 is a deficient number, since it is larger than the sum of its proper divisors (928865353).

261011084951 is an equidigital number, since it uses as much as digits as its factorization.

261011084951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928865352.

The product of its (nonzero) digits is 17280, while the sum is 38.

The spelling of 261011084951 in words is "two hundred sixty-one billion, eleven million, eighty-four thousand, nine hundred fifty-one".