19674772991 has 4 divisors (see below), whose sum is σ = 19675117632. Its totient is φ = 19674428352.

The previous prime is 19674772969. The next prime is 19674773003. The reversal of 19674772991 is 19927747691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19927747691 = 87317 ⋅228223.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19674772991 is a prime.

It is a super-4 number, since 4×19674772991⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19674772591) 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, 63986 + ... + 208431.

It is an arithmetic number, because the mean of its divisors is an integer number (4918779408).

Almost surely, 2^19674772991 is an apocalyptic number.

19674772991 is a deficient number, since it is larger than the sum of its proper divisors (344641).

19674772991 is an equidigital number, since it uses as much as digits as its factorization.

19674772991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344640.

The product of its digits is 12002256, while the sum is 62.

The spelling of 19674772991 in words is "nineteen billion, six hundred seventy-four million, seven hundred seventy-two thousand, nine hundred ninety-one".