19706972749 has 2 divisors, whose sum is σ = 19706972750. Its totient is φ = 19706972748.

The previous prime is 19706972737. The next prime is 19706972759. The reversal of 19706972749 is 94727960791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16745654025 + 2961318724 = 129405^2 + 54418^2 .

It is a cyclic number.

It is not a de Polignac number, because 19706972749 - 2²⁹ = 19170101837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19706972759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9853486374 + 9853486375.

It is an arithmetic number, because the mean of its divisors is an integer number (9853486375).

Almost surely, 2^19706972749 is an apocalyptic number.

It is an amenable number.

19706972749 is a deficient number, since it is larger than the sum of its proper divisors (1).

19706972749 is an equidigital number, since it uses as much as digits as its factorization.

19706972749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12002256, while the sum is 61.

The spelling of 19706972749 in words is "nineteen billion, seven hundred six million, nine hundred seventy-two thousand, seven hundred forty-nine".