19985279467 has 2 divisors, whose sum is σ = 19985279468. Its totient is φ = 19985279466.

The previous prime is 19985279359. The next prime is 19985279497. The reversal of 19985279467 is 76497258991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19985279467 is a prime.

It is a super-2 number, since 2×19985279467² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19985279497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9992639733 + 9992639734.

It is an arithmetic number, because the mean of its divisors is an integer number (9992639734).

Almost surely, 2^19985279467 is an apocalyptic number.

19985279467 is a deficient number, since it is larger than the sum of its proper divisors (1).

19985279467 is an equidigital number, since it uses as much as digits as its factorization.

19985279467 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68584320, while the sum is 67.

The spelling of 19985279467 in words is "nineteen billion, nine hundred eighty-five million, two hundred seventy-nine thousand, four hundred sixty-seven".