10911801987 has 6 divisors (see below), whose sum is σ = 15761491772. Its totient is φ = 7274534652.

The previous prime is 10911801937. The next prime is 10911802007. The reversal of 10911801987 is 78910811901.

It is not a de Polignac number, because 10911801987 - 2¹⁸ = 10911539843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10911801937) 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, 606211213 + ... + 606211230.

Almost surely, 2^10911801987 is an apocalyptic number.

10911801987 is a deficient number, since it is larger than the sum of its proper divisors (4849689785).

10911801987 is a wasteful number, since it uses less digits than its factorization.

10911801987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212422449 (or 1212422446 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 45.

The spelling of 10911801987 in words is "ten billion, nine hundred eleven million, eight hundred one thousand, nine hundred eighty-seven".