261266408530 has 8 divisors (see below), whose sum is σ = 470279535372. Its totient is φ = 104506563408.

The previous prime is 261266408509. The next prime is 261266408569. The reversal of 261266408530 is 35804662162.

It can be written as a sum of positive squares in 2 ways, for example, as 244345341969 + 16921066561 = 494313^2 + 130081^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13063320417 + ... + 13063320436.

Almost surely, 2^261266408530 is an apocalyptic number.

261266408530 is a deficient number, since it is larger than the sum of its proper divisors (209013126842).

261266408530 is a wasteful number, since it uses less digits than its factorization.

261266408530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26126640860.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 261266408530 in words is "two hundred sixty-one billion, two hundred sixty-six million, four hundred eight thousand, five hundred thirty".