19912964603423 has 2 divisors, whose sum is σ = 19912964603424. Its totient is φ = 19912964603422.

The previous prime is 19912964603407. The next prime is 19912964603489. The reversal of 19912964603423 is 32430646921991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19912964603423 - 2⁴ = 19912964603407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19912964600423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9956482301711 + 9956482301712.

It is an arithmetic number, because the mean of its divisors is an integer number (9956482301712).

Almost surely, 2^{19912964603423} is an apocalyptic number.

19912964603423 is a deficient number, since it is larger than the sum of its proper divisors (1).

19912964603423 is an equidigital number, since it uses as much as digits as its factorization.

19912964603423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15116544, while the sum is 59.

The spelling of 19912964603423 in words is "nineteen trillion, nine hundred twelve billion, nine hundred sixty-four million, six hundred three thousand, four hundred twenty-three".