19912964603489 has 2 divisors, whose sum is σ = 19912964603490. Its totient is φ = 19912964603488.

The previous prime is 19912964603423. The next prime is 19912964603503. The reversal of 19912964603489 is 98430646921991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16873897606225 + 3039066997264 = 4107785^2 + 1743292^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19912964603489 is a prime.

It is not a weakly prime, because it can be changed into another prime (19912964608489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9956482301744 + 9956482301745.

It is an arithmetic number, because the mean of its divisors is an integer number (9956482301745).

Almost surely, 2^{19912964603489} is an apocalyptic number.

It is an amenable number.

19912964603489 is a deficient number, since it is larger than the sum of its proper divisors (1).

19912964603489 is an equidigital number, since it uses as much as digits as its factorization.

19912964603489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181398528, while the sum is 71.

The spelling of 19912964603489 in words is "nineteen trillion, nine hundred twelve billion, nine hundred sixty-four million, six hundred three thousand, four hundred eighty-nine".