19665464701 has 2 divisors, whose sum is σ = 19665464702. Its totient is φ = 19665464700.

The previous prime is 19665464563. The next prime is 19665464719. The reversal of 19665464701 is 10746456691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12381012900 + 7284451801 = 111270^2 + 85349^2 .

It is an emirp because it is prime and its reverse (10746456691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19665464701 - 2²⁵ = 19631910269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19665464201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9832732350 + 9832732351.

It is an arithmetic number, because the mean of its divisors is an integer number (9832732351).

Almost surely, 2^19665464701 is an apocalyptic number.

It is an amenable number.

19665464701 is a deficient number, since it is larger than the sum of its proper divisors (1).

19665464701 is an equidigital number, since it uses as much as digits as its factorization.

19665464701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 19665464701 in words is "nineteen billion, six hundred sixty-five million, four hundred sixty-four thousand, seven hundred one".