19942574737 has 4 divisors (see below), whose sum is σ = 19943697700. Its totient is φ = 19941451776.

The previous prime is 19942574731. The next prime is 19942574749. The reversal of 19942574737 is 73747524991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10962927616 + 8979647121 = 104704^2 + 94761^2 .

It is a cyclic number.

It is not a de Polignac number, because 19942574737 - 2¹⁹ = 19942050449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19942574731) 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, 534408 + ... + 570505.

It is an arithmetic number, because the mean of its divisors is an integer number (4985924425).

Almost surely, 2^19942574737 is an apocalyptic number.

It is an amenable number.

19942574737 is a deficient number, since it is larger than the sum of its proper divisors (1122963).

19942574737 is a wasteful number, since it uses less digits than its factorization.

19942574737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122962.

The product of its digits is 13335840, while the sum is 58.

The spelling of 19942574737 in words is "nineteen billion, nine hundred forty-two million, five hundred seventy-four thousand, seven hundred thirty-seven".