19979539043 has 2 divisors, whose sum is σ = 19979539044. Its totient is φ = 19979539042.

The previous prime is 19979539001. The next prime is 19979539061. The reversal of 19979539043 is 34093597991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19979539043 - 2¹⁴ = 19979522659 is a prime.

It is a super-2 number, since 2×19979539043² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19979539093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9989769521 + 9989769522.

It is an arithmetic number, because the mean of its divisors is an integer number (9989769522).

Almost surely, 2^19979539043 is an apocalyptic number.

19979539043 is a deficient number, since it is larger than the sum of its proper divisors (1).

19979539043 is an equidigital number, since it uses as much as digits as its factorization.

19979539043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8266860, while the sum is 59.

The spelling of 19979539043 in words is "nineteen billion, nine hundred seventy-nine million, five hundred thirty-nine thousand, forty-three".