19020666697 has 4 divisors (see below), whose sum is σ = 19249831440. Its totient is φ = 18791501956.

The previous prime is 19020666689. The next prime is 19020666713. The reversal of 19020666697 is 79666602091.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79666602091 = 225671 ⋅353021.

It is a cyclic number.

It is not a de Polignac number, because 19020666697 - 2³ = 19020666689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19020666607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114582247 + ... + 114582412.

It is an arithmetic number, because the mean of its divisors is an integer number (4812457860).

Almost surely, 2^19020666697 is an apocalyptic number.

It is an amenable number.

19020666697 is a deficient number, since it is larger than the sum of its proper divisors (229164743).

19020666697 is an equidigital number, since it uses as much as digits as its factorization.

19020666697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229164742.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The spelling of 19020666697 in words is "nineteen billion, twenty million, six hundred sixty-six thousand, six hundred ninety-seven".