19981659933419 has 2 divisors, whose sum is σ = 19981659933420. Its totient is φ = 19981659933418.

The previous prime is 19981659933407. The next prime is 19981659933493. The reversal of 19981659933419 is 91433995618991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19981659933419 - 2¹² = 19981659929323 is a prime.

It is a super-2 number, since 2×19981659933419² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19981659933419.

It is not a weakly prime, because it can be changed into another prime (19981659953419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9990829966709 + 9990829966710.

It is an arithmetic number, because the mean of its divisors is an integer number (9990829966710).

Almost surely, 2^{19981659933419} is an apocalyptic number.

19981659933419 is a deficient number, since it is larger than the sum of its proper divisors (1).

19981659933419 is an equidigital number, since it uses as much as digits as its factorization.

19981659933419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 510183360, while the sum is 77.

The spelling of 19981659933419 in words is "nineteen trillion, nine hundred eighty-one billion, six hundred fifty-nine million, nine hundred thirty-three thousand, four hundred nineteen".