19739906993 has 2 divisors, whose sum is σ = 19739906994. Its totient is φ = 19739906992.

The previous prime is 19739906957. The next prime is 19739907001. The reversal of 19739906993 is 39960993791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17431392784 + 2308514209 = 132028^2 + 48047^2 .

It is a cyclic number.

It is not a de Polignac number, because 19739906993 - 2⁸ = 19739906737 is a prime.

It is not a weakly prime, because it can be changed into another prime (19739906293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9869953496 + 9869953497.

It is an arithmetic number, because the mean of its divisors is an integer number (9869953497).

Almost surely, 2^19739906993 is an apocalyptic number.

It is an amenable number.

19739906993 is a deficient number, since it is larger than the sum of its proper divisors (1).

19739906993 is an equidigital number, since it uses as much as digits as its factorization.

19739906993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22320522, while the sum is 65.

The spelling of 19739906993 in words is "nineteen billion, seven hundred thirty-nine million, nine hundred six thousand, nine hundred ninety-three".