1066646431 has 2 divisors, whose sum is σ = 1066646432. Its totient is φ = 1066646430.

The previous prime is 1066646429. The next prime is 1066646443. The reversal of 1066646431 is 1346466601.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1066646431 - 2¹ = 1066646429 is a prime.

It is a super-2 number, since 2×1066646431² = 2275469217530075522, which contains 22 as substring.

Together with 1066646429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066646401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533323215 + 533323216.

It is an arithmetic number, because the mean of its divisors is an integer number (533323216).

Almost surely, 2^1066646431 is an apocalyptic number.

1066646431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066646431 is an equidigital number, since it uses as much as digits as its factorization.

1066646431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 1066646431 is about 32659.5534415276. The cubic root of 1066646431 is about 1021.7394486579.

The spelling of 1066646431 in words is "one billion, sixty-six million, six hundred forty-six thousand, four hundred thirty-one".