19793978552 has 8 divisors (see below), whose sum is σ = 37113709800. Its totient is φ = 9896989272.

The previous prime is 19793978551. The next prime is 19793978557. The reversal of 19793978552 is 25587939791.

It is a happy number.

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 (19793978551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1237123652 + ... + 1237123667.

It is an arithmetic number, because the mean of its divisors is an integer number (4639213725).

Almost surely, 2^19793978552 is an apocalyptic number.

It is an amenable number.

19793978552 is a deficient number, since it is larger than the sum of its proper divisors (17319731248).

19793978552 is a wasteful number, since it uses less digits than its factorization.

19793978552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2474247325 (or 2474247321 counting only the distinct ones).

The product of its digits is 42865200, while the sum is 65.

The spelling of 19793978552 in words is "nineteen billion, seven hundred ninety-three million, nine hundred seventy-eight thousand, five hundred fifty-two".