19657212427 has 2 divisors, whose sum is σ = 19657212428. Its totient is φ = 19657212426.

The previous prime is 19657212403. The next prime is 19657212431. The reversal of 19657212427 is 72421275691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19657212427 - 2¹¹ = 19657210379 is a prime.

It is not a weakly prime, because it can be changed into another prime (19657213427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9828606213 + 9828606214.

It is an arithmetic number, because the mean of its divisors is an integer number (9828606214).

Almost surely, 2^19657212427 is an apocalyptic number.

19657212427 is a deficient number, since it is larger than the sum of its proper divisors (1).

19657212427 is an equidigital number, since it uses as much as digits as its factorization.

19657212427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 46.

The spelling of 19657212427 in words is "nineteen billion, six hundred fifty-seven million, two hundred twelve thousand, four hundred twenty-seven".