1066640023 has 2 divisors, whose sum is σ = 1066640024. Its totient is φ = 1066640022.

The previous prime is 1066640017. The next prime is 1066640041. The reversal of 1066640023 is 3200466601.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1066640023 - 2¹⁷ = 1066508951 is a prime.

It is a super-2 number, since 2×1066640023² = 2275441877330881058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1066639973 and 1066640000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066640623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533320011 + 533320012.

It is an arithmetic number, because the mean of its divisors is an integer number (533320012).

Almost surely, 2^1066640023 is an apocalyptic number.

1066640023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066640023 is an equidigital number, since it uses as much as digits as its factorization.

1066640023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 1066640023 is about 32659.4553383855. The cubic root of 1066640023 is about 1021.7374025818.

The spelling of 1066640023 in words is "one billion, sixty-six million, six hundred forty thousand, twenty-three".