1666437131 has 2 divisors, whose sum is σ = 1666437132. Its totient is φ = 1666437130.

The previous prime is 1666437109. The next prime is 1666437137. The reversal of 1666437131 is 1317346661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666437131 - 2³⁰ = 592695307 is a prime.

It is a super-2 number, since 2×1666437131² = 5554025423151022322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1666437137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833218565 + 833218566.

It is an arithmetic number, because the mean of its divisors is an integer number (833218566).

Almost surely, 2^1666437131 is an apocalyptic number.

1666437131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666437131 is an equidigital number, since it uses as much as digits as its factorization.

1666437131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 1666437131 is about 40822.0177232826. The cubic root of 1666437131 is about 1185.5766700728.

The spelling of 1666437131 in words is "one billion, six hundred sixty-six million, four hundred thirty-seven thousand, one hundred thirty-one".