19665423790252 has 24 divisors (see below), whose sum is σ = 34804853329680. Its totient is φ = 9721203360000.

The previous prime is 19665423790237. The next prime is 19665423790279. The reversal of 19665423790252 is 25209732456691.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452752 + ... + 6287752.

It is an arithmetic number, because the mean of its divisors is an integer number (1450202222070).

Almost surely, 2^{19665423790252} is an apocalyptic number.

It is an amenable number.

19665423790252 is a deficient number, since it is larger than the sum of its proper divisors (15139429539428).

19665423790252 is a wasteful number, since it uses less digits than its factorization.

19665423790252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5844561 (or 5844559 counting only the distinct ones).

The product of its (nonzero) digits is 48988800, while the sum is 61.

The spelling of 19665423790252 in words is "nineteen trillion, six hundred sixty-five billion, four hundred twenty-three million, seven hundred ninety thousand, two hundred fifty-two".