19256149693 has 6 divisors (see below), whose sum is σ = 21165850622. Its totient is φ = 17505590520.

The previous prime is 19256149651. The next prime is 19256149799. The reversal of 19256149693 is 39694165291.

It can be written as a sum of positive squares in only one way, i.e., 15132198169 + 4123951524 = 123013^2 + 64218^2 .

It is a de Polignac number, because none of the positive numbers 2^k-19256149693 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 (19256141693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79570746 + ... + 79570987.

Almost surely, 2^19256149693 is an apocalyptic number.

It is an amenable number.

19256149693 is a deficient number, since it is larger than the sum of its proper divisors (1909700929).

19256149693 is a wasteful number, since it uses less digits than its factorization.

19256149693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159141755 (or 159141744 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 55.

The spelling of 19256149693 in words is "nineteen billion, two hundred fifty-six million, one hundred forty-nine thousand, six hundred ninety-three".