261420660303255 has 24 divisors (see below), whose sum is σ = 453151416184272. Its totient is φ = 139417499343744.

The previous prime is 261420660303227. The next prime is 261420660303269. The reversal of 261420660303255 is 552303066024162.

261420660303255 is a `hidden beast` number, since 2 + 6 + 1 + 4 + 2 + 0 + 6 + 603 + 0 + 32 + 5 + 5 = 666.

It is not a de Polignac number, because 261420660303255 - 2¹³ = 261420660295063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 261420660303255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141841254 + ... + 143672483.

It is an arithmetic number, because the mean of its divisors is an integer number (18881309007678).

Almost surely, 2^{261420660303255} is an apocalyptic number.

261420660303255 is a deficient number, since it is larger than the sum of its proper divisors (191730755881017).

261420660303255 is a wasteful number, since it uses less digits than its factorization.

261420660303255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285534095 (or 285534092 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 45.

The spelling of 261420660303255 in words is "two hundred sixty-one trillion, four hundred twenty billion, six hundred sixty million, three hundred three thousand, two hundred fifty-five".