1781376622427 has 2 divisors, whose sum is σ = 1781376622428. Its totient is φ = 1781376622426.

The previous prime is 1781376622387. The next prime is 1781376622439. The reversal of 1781376622427 is 7242266731871.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1781376622427 is a prime.

It is not a weakly prime, because it can be changed into another prime (1781376622447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890688311213 + 890688311214.

It is an arithmetic number, because the mean of its divisors is an integer number (890688311214).

Almost surely, 2^{1781376622427} is an apocalyptic number.

1781376622427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1781376622427 is an equidigital number, since it uses as much as digits as its factorization.

1781376622427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9483264, while the sum is 56.

The spelling of 1781376622427 in words is "one trillion, seven hundred eighty-one billion, three hundred seventy-six million, six hundred twenty-two thousand, four hundred twenty-seven".