19767436973 has 2 divisors, whose sum is σ = 19767436974. Its totient is φ = 19767436972.

The previous prime is 19767436951. The next prime is 19767436993. The reversal of 19767436973 is 37963476791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12922687684 + 6844749289 = 113678^2 + 82733^2 .

It is a cyclic number.

It is not a de Polignac number, because 19767436973 - 2¹⁸ = 19767174829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19767436903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9883718486 + 9883718487.

It is an arithmetic number, because the mean of its divisors is an integer number (9883718487).

Almost surely, 2^19767436973 is an apocalyptic number.

It is an amenable number.

19767436973 is a deficient number, since it is larger than the sum of its proper divisors (1).

19767436973 is an equidigital number, since it uses as much as digits as its factorization.

19767436973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36006768, while the sum is 62.

The spelling of 19767436973 in words is "nineteen billion, seven hundred sixty-seven million, four hundred thirty-six thousand, nine hundred seventy-three".