1091987476768 has 24 divisors (see below), whose sum is σ = 2152443702780. Its totient is φ = 545335107840.

The previous prime is 1091987476711. The next prime is 1091987476819. The reversal of 1091987476768 is 8676747891901.

1091987476768 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1082041004944 + 9946471824 = 1040212^2 + 99732^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1091987476768.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20555263 + ... + 20608318.

Almost surely, 2^{1091987476768} is an apocalyptic number.

It is an amenable number.

1091987476768 is a deficient number, since it is larger than the sum of its proper divisors (1060456226012).

1091987476768 is an equidigital number, since it uses as much as digits as its factorization.

1091987476768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41164420 (or 41164412 counting only the distinct ones).

The product of its (nonzero) digits is 256048128, while the sum is 73.

The spelling of 1091987476768 in words is "one trillion, ninety-one billion, nine hundred eighty-seven million, four hundred seventy-six thousand, seven hundred sixty-eight".