17899139746 has 4 divisors (see below), whose sum is σ = 26848709622. Its totient is φ = 8949569872.

The previous prime is 17899139651. The next prime is 17899139747. The reversal of 17899139746 is 64793199871.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64793199871 = 1291 ⋅50188381.

It can be written as a sum of positive squares in only one way, i.e., 10556535025 + 7342604721 = 102745^2 + 85689^2 .

It is not an unprimeable number, because it can be changed into a prime (17899139747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4474784935 + ... + 4474784938.

Almost surely, 2^17899139746 is an apocalyptic number.

17899139746 is a deficient number, since it is larger than the sum of its proper divisors (8949569876).

17899139746 is an equidigital number, since it uses as much as digits as its factorization.

17899139746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8949569875.

The product of its digits is 20575296, while the sum is 64.

The spelling of 17899139746 in words is "seventeen billion, eight hundred ninety-nine million, one hundred thirty-nine thousand, seven hundred forty-six".