19850973829 has 2 divisors, whose sum is σ = 19850973830. Its totient is φ = 19850973828.

The previous prime is 19850973823. The next prime is 19850973833. The reversal of 19850973829 is 92837905891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19396132900 + 454840929 = 139270^2 + 21327^2 .

It is a cyclic number.

It is not a de Polignac number, because 19850973829 - 2¹⁷ = 19850842757 is a prime.

It is a super-2 number, since 2×19850973829² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19850973823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9925486914 + 9925486915.

It is an arithmetic number, because the mean of its divisors is an integer number (9925486915).

Almost surely, 2^19850973829 is an apocalyptic number.

It is an amenable number.

19850973829 is a deficient number, since it is larger than the sum of its proper divisors (1).

19850973829 is an equidigital number, since it uses as much as digits as its factorization.

19850973829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9797760, while the sum is 61.

The spelling of 19850973829 in words is "nineteen billion, eight hundred fifty million, nine hundred seventy-three thousand, eight hundred twenty-nine".