261312747455 has 8 divisors (see below), whose sum is σ = 324388238400. Its totient is φ = 201841570336.

The previous prime is 261312747431. The next prime is 261312747473. The reversal of 261312747455 is 554747213162.

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

It is a cyclic number.

It is not a de Polignac number, because 261312747455 - 2³⁶ = 192593270719 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 901078295 + ... + 901078584.

It is an arithmetic number, because the mean of its divisors is an integer number (40548529800).

Almost surely, 2^261312747455 is an apocalyptic number.

261312747455 is a deficient number, since it is larger than the sum of its proper divisors (63075490945).

261312747455 is a wasteful number, since it uses less digits than its factorization.

261312747455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802156913.

The product of its digits is 1411200, while the sum is 47.

The spelling of 261312747455 in words is "two hundred sixty-one billion, three hundred twelve million, seven hundred forty-seven thousand, four hundred fifty-five".