261363755 has 8 divisors (see below), whose sum is σ = 313774512. Its totient is φ = 208999008.

The previous prime is 261363727. The next prime is 261363769. The reversal of 261363755 is 557363162.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261363755 is a prime.

It is a super-2 number, since 2×261363755² = 136622024855400050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2564 + ... + 23006.

It is an arithmetic number, because the mean of its divisors is an integer number (39221814).

Almost surely, 2^261363755 is an apocalyptic number.

261363755 is a deficient number, since it is larger than the sum of its proper divisors (52410757).

261363755 is a wasteful number, since it uses less digits than its factorization.

261363755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23005.

The product of its digits is 113400, while the sum is 38.

The square root of 261363755 is about 16166.7484362193. The cubic root of 261363755 is about 639.3644039801.

The spelling of 261363755 in words is "two hundred sixty-one million, three hundred sixty-three thousand, seven hundred fifty-five".