1666027537 has 2 divisors, whose sum is σ = 1666027538. Its totient is φ = 1666027536.

The previous prime is 1666027501. The next prime is 1666027549. The reversal of 1666027537 is 7357206661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1663334656 + 2692881 = 40784^2 + 1641^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666027537 - 2¹⁵ = 1665994769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666027493 and 1666027502.

It is not a weakly prime, because it can be changed into another prime (1666027577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833013768 + 833013769.

It is an arithmetic number, because the mean of its divisors is an integer number (833013769).

Almost surely, 2^1666027537 is an apocalyptic number.

It is an amenable number.

1666027537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666027537 is an equidigital number, since it uses as much as digits as its factorization.

1666027537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 1666027537 is about 40817.0005879903. Note that the first 3 decimals coincide. The cubic root of 1666027537 is about 1185.4795277178.

The spelling of 1666027537 in words is "one billion, six hundred sixty-six million, twenty-seven thousand, five hundred thirty-seven".