19619813914 has 4 divisors (see below), whose sum is σ = 29429720874. Its totient is φ = 9809906956.

The previous prime is 19619813891. The next prime is 19619813923. The reversal of 19619813914 is 41931891691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41931891691 = 22621 ⋅1853671.

It can be written as a sum of positive squares in only one way, i.e., 10323576025 + 9296237889 = 101605^2 + 96417^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4904953477 + ... + 4904953480.

Almost surely, 2^19619813914 is an apocalyptic number.

19619813914 is a deficient number, since it is larger than the sum of its proper divisors (9809906960).

19619813914 is an equidigital number, since it uses as much as digits as its factorization.

19619813914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9809906959.

The product of its digits is 419904, while the sum is 52.

The spelling of 19619813914 in words is "nineteen billion, six hundred nineteen million, eight hundred thirteen thousand, nine hundred fourteen".