2117787290788 has 12 divisors (see below), whose sum is σ = 3991214509660. Its totient is φ = 977440288032.

The previous prime is 2117787290777. The next prime is 2117787290789. The reversal of 2117787290788 is 8870927877112.

It can be written as a sum of positive squares in 2 ways, for example, as 150747380644 + 1967039910144 = 388262^2 + 1402512^2 .

It is a hoax number, since the sum of its digits (67) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2117787290789) 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, 20363339283 + ... + 20363339386.

Almost surely, 2^{2117787290788} is an apocalyptic number.

It is an amenable number.

2117787290788 is a deficient number, since it is larger than the sum of its proper divisors (1873427218872).

2117787290788 is a wasteful number, since it uses less digits than its factorization.

2117787290788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40726678686 (or 40726678684 counting only the distinct ones).

The product of its (nonzero) digits is 44255232, while the sum is 67.

The spelling of 2117787290788 in words is "two trillion, one hundred seventeen billion, seven hundred eighty-seven million, two hundred ninety thousand, seven hundred eighty-eight".