19136812642 has 8 divisors (see below), whose sum is σ = 28816913196. Its totient is φ = 9531174912.

The previous prime is 19136812633. The next prime is 19136812649. The reversal of 19136812642 is 24621863191.

It can be written as a sum of positive squares in 2 ways, for example, as 18927981241 + 208831401 = 137579^2 + 14451^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19136812642² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19136812649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18615063 + ... + 18616090.

Almost surely, 2^19136812642 is an apocalyptic number.

19136812642 is a deficient number, since it is larger than the sum of its proper divisors (9680100554).

19136812642 is a wasteful number, since it uses less digits than its factorization.

19136812642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37231412.

The product of its digits is 124416, while the sum is 43.

The spelling of 19136812642 in words is "nineteen billion, one hundred thirty-six million, eight hundred twelve thousand, six hundred forty-two".