19959156479 has 2 divisors, whose sum is σ = 19959156480. Its totient is φ = 19959156478.

The previous prime is 19959156389. The next prime is 19959156491. The reversal of 19959156479 is 97465195991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19959156479 - 2¹² = 19959152383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19959156379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9979578239 + 9979578240.

It is an arithmetic number, because the mean of its divisors is an integer number (9979578240).

Almost surely, 2^19959156479 is an apocalyptic number.

19959156479 is a deficient number, since it is larger than the sum of its proper divisors (1).

19959156479 is an equidigital number, since it uses as much as digits as its factorization.

19959156479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27556200, while the sum is 65.

The spelling of 19959156479 in words is "nineteen billion, nine hundred fifty-nine million, one hundred fifty-six thousand, four hundred seventy-nine".