1666614457 has 2 divisors, whose sum is σ = 1666614458. Its totient is φ = 1666614456.

The previous prime is 1666614413. The next prime is 1666614461. The reversal of 1666614457 is 7544166661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1445824576 + 220789881 = 38024^2 + 14859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666614457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666614487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833307228 + 833307229.

It is an arithmetic number, because the mean of its divisors is an integer number (833307229).

Almost surely, 2^1666614457 is an apocalyptic number.

It is an amenable number.

1666614457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666614457 is an equidigital number, since it uses as much as digits as its factorization.

1666614457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 46.

The square root of 1666614457 is about 40824.1896061636. The cubic root of 1666614457 is about 1185.6187210865.

The spelling of 1666614457 in words is "one billion, six hundred sixty-six million, six hundred fourteen thousand, four hundred fifty-seven".