261477455261 has 8 divisors (see below), whose sum is σ = 285679681248. Its totient is φ = 237347154000.

The previous prime is 261477455233. The next prime is 261477455339. The reversal of 261477455261 is 162554774162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-261477455261 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 (261477455231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17973575 + ... + 17988116.

It is an arithmetic number, because the mean of its divisors is an integer number (35709960156).

Almost surely, 2^261477455261 is an apocalyptic number.

It is an amenable number.

261477455261 is a deficient number, since it is larger than the sum of its proper divisors (24202225987).

261477455261 is a wasteful number, since it uses less digits than its factorization.

261477455261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35962363.

The product of its digits is 2822400, while the sum is 50.

The spelling of 261477455261 in words is "two hundred sixty-one billion, four hundred seventy-seven million, four hundred fifty-five thousand, two hundred sixty-one".