11731156550 has 24 divisors (see below), whose sum is σ = 21897079896. Its totient is φ = 4675875840.

The previous prime is 11731156537. The next prime is 11731156559. The reversal of 11731156550 is 5565113711.

It is a self number, because there is not a number n which added to its sum of digits gives 11731156550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11731156559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 400379 + ... + 428678.

It is an arithmetic number, because the mean of its divisors is an integer number (912378329).

Almost surely, 2^11731156550 is an apocalyptic number.

11731156550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11731156550 is a deficient number, since it is larger than the sum of its proper divisors (10165923346).

11731156550 is a wasteful number, since it uses less digits than its factorization.

11731156550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829352 (or 829347 counting only the distinct ones).

The product of its (nonzero) digits is 15750, while the sum is 35.

The spelling of 11731156550 in words is "eleven billion, seven hundred thirty-one million, one hundred fifty-six thousand, five hundred fifty".