19740249973 has 2 divisors, whose sum is σ = 19740249974. Its totient is φ = 19740249972.

The previous prime is 19740249931. The next prime is 19740250067. The reversal of 19740249973 is 37994204791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18598958884 + 1141291089 = 136378^2 + 33783^2 .

It is a cyclic number.

It is not a de Polignac number, because 19740249973 - 2³³ = 11150315381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19740249773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9870124986 + 9870124987.

It is an arithmetic number, because the mean of its divisors is an integer number (9870124987).

Almost surely, 2^19740249973 is an apocalyptic number.

It is an amenable number.

19740249973 is a deficient number, since it is larger than the sum of its proper divisors (1).

19740249973 is an equidigital number, since it uses as much as digits as its factorization.

19740249973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3429216, while the sum is 55.

The spelling of 19740249973 in words is "nineteen billion, seven hundred forty million, two hundred forty-nine thousand, nine hundred seventy-three".