19674772993 has 4 divisors (see below), whose sum is σ = 19675865668. Its totient is φ = 19673680320.

The previous prime is 19674772969. The next prime is 19674773003. The reversal of 19674772993 is 39927747691.

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 13756240369 + 5918532624 = 117287^2 + 76932^2 .

It is a cyclic number.

It is not a de Polignac number, because 19674772993 - 2¹³ = 19674764801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19674772913) 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, 518868 + ... + 555493.

It is an arithmetic number, because the mean of its divisors is an integer number (4918966417).

Almost surely, 2^19674772993 is an apocalyptic number.

It is an amenable number.

19674772993 is a deficient number, since it is larger than the sum of its proper divisors (1092675).

19674772993 is a wasteful number, since it uses less digits than its factorization.

19674772993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092674.

The product of its digits is 36006768, while the sum is 64.

The spelling of 19674772993 in words is "nineteen billion, six hundred seventy-four million, seven hundred seventy-two thousand, nine hundred ninety-three".