1661412427 has 2 divisors, whose sum is σ = 1661412428. Its totient is φ = 1661412426.

The previous prime is 1661412391. The next prime is 1661412449. The reversal of 1661412427 is 7242141661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1661412427 - 2⁷ = 1661412299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1661412392 and 1661412401.

It is not a weakly prime, because it can be changed into another prime (1661412527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830706213 + 830706214.

It is an arithmetic number, because the mean of its divisors is an integer number (830706214).

Almost surely, 2^1661412427 is an apocalyptic number.

1661412427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661412427 is an equidigital number, since it uses as much as digits as its factorization.

1661412427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 1661412427 is about 40760.4272180751. The cubic root of 1661412427 is about 1184.3838719357.

The spelling of 1661412427 in words is "one billion, six hundred sixty-one million, four hundred twelve thousand, four hundred twenty-seven".