261243256645230 has 32 divisors (see below), whose sum is σ = 638813699272224. Its totient is φ = 68350436958336.

The previous prime is 261243256645183. The next prime is 261243256645279. The reversal of 261243256645230 is 32546652342162.

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, 82151965909 + ... + 82151969088.

It is an arithmetic number, because the mean of its divisors is an integer number (19962928102257).

Almost surely, 2^{261243256645230} is an apocalyptic number.

261243256645230 is an abundant number, since it is smaller than the sum of its proper divisors (377570442626994).

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

261243256645230 is a wasteful number, since it uses less digits than its factorization.

261243256645230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164303935060.

The product of its (nonzero) digits is 12441600, while the sum is 51.

The spelling of 261243256645230 in words is "two hundred sixty-one trillion, two hundred forty-three billion, two hundred fifty-six million, six hundred forty-five thousand, two hundred thirty".