11551767880 has 16 divisors (see below), whose sum is σ = 25991477820. Its totient is φ = 4620707136.

The previous prime is 11551767853. The next prime is 11551767889. The reversal of 11551767880 is 8876715511.

It can be written as a sum of positive squares in 2 ways, for example, as 11050634884 + 501132996 = 105122^2 + 22386^2 .

It is not an unprimeable number, because it can be changed into a prime (11551767889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144397059 + ... + 144397138.

Almost surely, 2^11551767880 is an apocalyptic number.

11551767880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11551767880 is an abundant number, since it is smaller than the sum of its proper divisors (14439709940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11551767880 is a wasteful number, since it uses less digits than its factorization.

11551767880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288794208 (or 288794204 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 49.

The spelling of 11551767880 in words is "eleven billion, five hundred fifty-one million, seven hundred sixty-seven thousand, eight hundred eighty".