17940113649 has 6 divisors (see below), whose sum is σ = 25913497506. Its totient is φ = 11960075760.

The previous prime is 17940113623. The next prime is 17940113677. The reversal of 17940113649 is 94631104971.

It is a happy number.

17940113649 is a `hidden beast` number, since 1 + 79 + 401 + 136 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11895828624 + 6044285025 = 109068^2 + 77745^2 .

It is a de Polignac number, because none of the positive numbers 2^k-17940113649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (17940113249) 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, 996672972 + ... + 996672989.

It is an arithmetic number, because the mean of its divisors is an integer number (4318916251).

Almost surely, 2^17940113649 is an apocalyptic number.

It is an amenable number.

17940113649 is a deficient number, since it is larger than the sum of its proper divisors (7973383857).

17940113649 is a wasteful number, since it uses less digits than its factorization.

17940113649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993345967 (or 1993345964 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 17940113649 in words is "seventeen billion, nine hundred forty million, one hundred thirteen thousand, six hundred forty-nine".