19806739769 has 2 divisors, whose sum is σ = 19806739770. Its totient is φ = 19806739768.

The previous prime is 19806739723. The next prime is 19806739789. The reversal of 19806739769 is 96793760891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16650547369 + 3156192400 = 129037^2 + 56180^2 .

It is a cyclic number.

It is not a de Polignac number, because 19806739769 - 2¹² = 19806735673 is a prime.

It is a super-2 number, since 2×19806739769² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19806739789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9903369884 + 9903369885.

It is an arithmetic number, because the mean of its divisors is an integer number (9903369885).

Almost surely, 2^19806739769 is an apocalyptic number.

It is an amenable number.

19806739769 is a deficient number, since it is larger than the sum of its proper divisors (1).

19806739769 is an equidigital number, since it uses as much as digits as its factorization.

19806739769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30862944, while the sum is 65.

The spelling of 19806739769 in words is "nineteen billion, eight hundred six million, seven hundred thirty-nine thousand, seven hundred sixty-nine".