261363849354 has 24 divisors (see below), whose sum is σ = 566307127620. Its totient is φ = 87118392768.

The previous prime is 261363849317. The next prime is 261363849359. The reversal of 261363849354 is 453948363162.

It can be written as a sum of positive squares in 2 ways, for example, as 259155319329 + 2208530025 = 509073^2 + 46995^2 .

It is a super-2 number, since 2×261363849354² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 261363849354.

It is not an unprimeable number, because it can be changed into a prime (261363849359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 356854 + ... + 806270.

Almost surely, 2^261363849354 is an apocalyptic number.

261363849354 is an abundant number, since it is smaller than the sum of its proper divisors (304943278266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261363849354 is a wasteful number, since it uses less digits than its factorization.

261363849354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481734 (or 481731 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 54.

The spelling of 261363849354 in words is "two hundred sixty-one billion, three hundred sixty-three million, eight hundred forty-nine thousand, three hundred fifty-four".