11861405259 has 16 divisors (see below), whose sum is σ = 17271770880. Its totient is φ = 7180889760.

The previous prime is 11861405249. The next prime is 11861405261. The reversal of 11861405259 is 95250416811.

It is not a de Polignac number, because 11861405259 - 2¹² = 11861401163 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11861405259.

It is not an unprimeable number, because it can be changed into a prime (11861405249) 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, 165232 + ... + 225885.

It is an arithmetic number, because the mean of its divisors is an integer number (1079485680).

Almost surely, 2^11861405259 is an apocalyptic number.

11861405259 is a deficient number, since it is larger than the sum of its proper divisors (5410365621).

11861405259 is a wasteful number, since it uses less digits than its factorization.

11861405259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392050.

The product of its (nonzero) digits is 86400, while the sum is 42.

The spelling of 11861405259 in words is "eleven billion, eight hundred sixty-one million, four hundred five thousand, two hundred fifty-nine".