19402143637 has 2 divisors, whose sum is σ = 19402143638. Its totient is φ = 19402143636.

The previous prime is 19402143623. The next prime is 19402143641. The reversal of 19402143637 is 73634120491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13298471761 + 6103671876 = 115319^2 + 78126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19402143637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19402143637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19402143437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9701071818 + 9701071819.

It is an arithmetic number, because the mean of its divisors is an integer number (9701071819).

Almost surely, 2^19402143637 is an apocalyptic number.

It is an amenable number.

19402143637 is a deficient number, since it is larger than the sum of its proper divisors (1).

19402143637 is an equidigital number, since it uses as much as digits as its factorization.

19402143637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 19402143637 in words is "nineteen billion, four hundred two million, one hundred forty-three thousand, six hundred thirty-seven".