19946988371 has 2 divisors, whose sum is σ = 19946988372. Its totient is φ = 19946988370.

The previous prime is 19946988361. The next prime is 19946988377. The reversal of 19946988371 is 17388964991.

It is a strong prime.

It is an emirp because it is prime and its reverse (17388964991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19946988371 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19946988298 and 19946988307.

It is not a weakly prime, because it can be changed into another prime (19946988377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9973494185 + 9973494186.

It is an arithmetic number, because the mean of its divisors is an integer number (9973494186).

Almost surely, 2^19946988371 is an apocalyptic number.

19946988371 is a deficient number, since it is larger than the sum of its proper divisors (1).

19946988371 is an equidigital number, since it uses as much as digits as its factorization.

19946988371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 65.

The spelling of 19946988371 in words is "nineteen billion, nine hundred forty-six million, nine hundred eighty-eight thousand, three hundred seventy-one".