261434375455 has 16 divisors (see below), whose sum is σ = 344703542400. Its totient is φ = 188766214560.

The previous prime is 261434375437. The next prime is 261434375473. The reversal of 261434375455 is 554573434162.

It is an interprime number because it is at equal distance from previous prime (261434375437) and next prime (261434375473).

It is not a de Polignac number, because 261434375455 - 2²³ = 261425986847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261434375399 and 261434375408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17090745 + ... + 17106034.

It is an arithmetic number, because the mean of its divisors is an integer number (21543971400).

Almost surely, 2^261434375455 is an apocalyptic number.

261434375455 is a deficient number, since it is larger than the sum of its proper divisors (83269166945).

261434375455 is a wasteful number, since it uses less digits than its factorization.

261434375455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34196934.

The product of its digits is 6048000, while the sum is 49.

The spelling of 261434375455 in words is "two hundred sixty-one billion, four hundred thirty-four million, three hundred seventy-five thousand, four hundred fifty-five".