1645356543427 has 2 divisors, whose sum is σ = 1645356543428. Its totient is φ = 1645356543426.

The previous prime is 1645356543421. The next prime is 1645356543431. The reversal of 1645356543427 is 7243456535461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1645356543427 - 2²³ = 1645348154819 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645356543421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822678271713 + 822678271714.

It is an arithmetic number, because the mean of its divisors is an integer number (822678271714).

Almost surely, 2^{1645356543427} is an apocalyptic number.

1645356543427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645356543427 is an equidigital number, since it uses as much as digits as its factorization.

1645356543427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288000, while the sum is 55.

The spelling of 1645356543427 in words is "one trillion, six hundred forty-five billion, three hundred fifty-six million, five hundred forty-three thousand, four hundred twenty-seven".