19745231008 has 12 divisors (see below), whose sum is σ = 38873423610. Its totient is φ = 9872615488.

The previous prime is 19745230997. The next prime is 19745231063. The reversal of 19745231008 is 80013254791.

It can be written as a sum of positive squares in only one way, i.e., 10138878864 + 9606352144 = 100692^2 + 98012^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308519203 + ... + 308519266.

Almost surely, 2^19745231008 is an apocalyptic number.

It is an amenable number.

19745231008 is a deficient number, since it is larger than the sum of its proper divisors (19128192602).

19745231008 is an equidigital number, since it uses as much as digits as its factorization.

19745231008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617038479 (or 617038471 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

Adding to 19745231008 its reverse (80013254791), we get a palindrome (99758485799).

The spelling of 19745231008 in words is "nineteen billion, seven hundred forty-five million, two hundred thirty-one thousand, eight".