261623183107 has 12 divisors (see below), whose sum is σ = 309689999920. Its totient is φ = 219543928560.

The previous prime is 261623183093. The next prime is 261623183137. The reversal of 261623183107 is 701381326162.

It is not a de Polignac number, because 261623183107 - 2¹⁵ = 261623150339 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261623183107.

It is not an unprimeable number, because it can be changed into a prime (261623183137) 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, 83159007 + ... + 83162152.

Almost surely, 2^261623183107 is an apocalyptic number.

261623183107 is a deficient number, since it is larger than the sum of its proper divisors (48066816813).

261623183107 is a wasteful number, since it uses less digits than its factorization.

261623183107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166321194 (or 166321183 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 261623183107 in words is "two hundred sixty-one billion, six hundred twenty-three million, one hundred eighty-three thousand, one hundred seven".