261907381211 has 8 divisors (see below), whose sum is σ = 302929019904. Its totient is φ = 221787317160.

The previous prime is 261907381207. The next prime is 261907381313. The reversal of 261907381211 is 112183709162.

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

It is a cyclic number.

It is not a de Polignac number, because 261907381211 - 2² = 261907381207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261907381111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225393035 + ... + 225394196.

It is an arithmetic number, because the mean of its divisors is an integer number (37866127488).

Almost surely, 2^261907381211 is an apocalyptic number.

261907381211 is a deficient number, since it is larger than the sum of its proper divisors (41021638693).

261907381211 is an equidigital number, since it uses as much as digits as its factorization.

261907381211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450787321.

The product of its (nonzero) digits is 36288, while the sum is 41.

The spelling of 261907381211 in words is "two hundred sixty-one billion, nine hundred seven million, three hundred eighty-one thousand, two hundred eleven".