19776492742 has 4 divisors (see below), whose sum is σ = 29664739116. Its totient is φ = 9888246370.

The previous prime is 19776492733. The next prime is 19776492767. The reversal of 19776492742 is 24729467791.

It is a happy number.

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

It is a super-2 number, since 2×19776492742² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4944123184 + ... + 4944123187.

It is an arithmetic number, because the mean of its divisors is an integer number (7416184779).

Almost surely, 2^19776492742 is an apocalyptic number.

19776492742 is a deficient number, since it is larger than the sum of its proper divisors (9888246374).

19776492742 is an equidigital number, since it uses as much as digits as its factorization.

19776492742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9888246373.

The product of its digits is 10668672, while the sum is 58.

The spelling of 19776492742 in words is "nineteen billion, seven hundred seventy-six million, four hundred ninety-two thousand, seven hundred forty-two".