11865375261 has 16 divisors (see below), whose sum is σ = 17580534400. Its totient is φ = 7909259904.

The previous prime is 11865375241. The next prime is 11865375281. The reversal of 11865375261 is 16257356811.

11865375261 is a `hidden beast` number, since 1 + 1 + 8 + 6 + 537 + 52 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (11865375241) and next prime (11865375281).

It is not a de Polignac number, because 11865375261 - 2¹⁵ = 11865342493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11865375241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239160 + ... + 284478.

It is an arithmetic number, because the mean of its divisors is an integer number (1098783400).

Almost surely, 2^11865375261 is an apocalyptic number.

It is an amenable number.

11865375261 is a deficient number, since it is larger than the sum of its proper divisors (5715159139).

11865375261 is an equidigital number, since it uses as much as digits as its factorization.

11865375261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55025 (or 55019 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The spelling of 11865375261 in words is "eleven billion, eight hundred sixty-five million, three hundred seventy-five thousand, two hundred sixty-one".