19612499197 has 4 divisors (see below), whose sum is σ = 19690636896. Its totient is φ = 19534361500.

The previous prime is 19612499177. The next prime is 19612499227. The reversal of 19612499197 is 79199421691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19612499197 - 2⁷ = 19612499069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19612499177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39068473 + ... + 39068974.

It is an arithmetic number, because the mean of its divisors is an integer number (4922659224).

Almost surely, 2^19612499197 is an apocalyptic number.

It is an amenable number.

19612499197 is a deficient number, since it is larger than the sum of its proper divisors (78137699).

19612499197 is an equidigital number, since it uses as much as digits as its factorization.

19612499197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78137698.

The product of its digits is 2204496, while the sum is 58.

The spelling of 19612499197 in words is "nineteen billion, six hundred twelve million, four hundred ninety-nine thousand, one hundred ninety-seven".