19649076989 has 2 divisors, whose sum is σ = 19649076990. Its totient is φ = 19649076988.

The previous prime is 19649076971. The next prime is 19649077009. The reversal of 19649076989 is 98967094691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15244100089 + 4404976900 = 123467^2 + 66370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19649076989 is a prime.

It is a super-2 number, since 2×19649076989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19649076919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9824538494 + 9824538495.

It is an arithmetic number, because the mean of its divisors is an integer number (9824538495).

Almost surely, 2^19649076989 is an apocalyptic number.

It is an amenable number.

19649076989 is a deficient number, since it is larger than the sum of its proper divisors (1).

19649076989 is an equidigital number, since it uses as much as digits as its factorization.

19649076989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52907904, while the sum is 68.

The spelling of 19649076989 in words is "nineteen billion, six hundred forty-nine million, seventy-six thousand, nine hundred eighty-nine".