19442774968 has 8 divisors (see below), whose sum is σ = 36455203080. Its totient is φ = 9721387480.

The previous prime is 19442774927. The next prime is 19442774969. The reversal of 19442774968 is 86947724491.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19442774969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1215173428 + ... + 1215173443.

It is an arithmetic number, because the mean of its divisors is an integer number (4556900385).

Almost surely, 2^19442774968 is an apocalyptic number.

It is an amenable number.

19442774968 is a deficient number, since it is larger than the sum of its proper divisors (17012428112).

19442774968 is a wasteful number, since it uses less digits than its factorization.

19442774968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2430346877 (or 2430346873 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 61.

The spelling of 19442774968 in words is "nineteen billion, four hundred forty-two million, seven hundred seventy-four thousand, nine hundred sixty-eight".