11861031550 has 12 divisors (see below), whose sum is σ = 22061518776. Its totient is φ = 4744412600.

The previous prime is 11861031521. The next prime is 11861031557. The reversal of 11861031550 is 5513016811.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11861031557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 118610266 + ... + 118610365.

It is an arithmetic number, because the mean of its divisors is an integer number (1838459898).

Almost surely, 2^11861031550 is an apocalyptic number.

11861031550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11861031550 is a deficient number, since it is larger than the sum of its proper divisors (10200487226).

11861031550 is a wasteful number, since it uses less digits than its factorization.

11861031550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237220643 (or 237220638 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 31.

The spelling of 11861031550 in words is "eleven billion, eight hundred sixty-one million, thirty-one thousand, five hundred fifty".