19776229442 has 6 divisors (see below), whose sum is σ = 29664642483. Its totient is φ = 9888015282.

The previous prime is 19776229409. The next prime is 19776229471. The reversal of 19776229442 is 24492267791.

It can be written as a sum of positive squares in only one way, i.e., 9888114721 + 9888114721 = 99439^2 + 99439^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=99439.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 149159 + ... + 248597.

Almost surely, 2^19776229442 is an apocalyptic number.

19776229442 is a deficient number, since it is larger than the sum of its proper divisors (9888413041).

19776229442 is an frugal number, since it uses more digits than its factorization.

19776229442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198880 (or 99441 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 53.

The spelling of 19776229442 in words is "nineteen billion, seven hundred seventy-six million, two hundred twenty-nine thousand, four hundred forty-two".