1066645431 has 24 divisors (see below), whose sum is σ = 1556462336. Its totient is φ = 703864080.

The previous prime is 1066645429. The next prime is 1066645477. The reversal of 1066645431 is 1345466601.

It is a happy number.

It is not a de Polignac number, because 1066645431 - 2¹ = 1066645429 is a prime.

It is a super-2 number, since 2×1066645431² = 2275464950946351522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066646431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 396216 + ... + 398898.

Almost surely, 2^1066645431 is an apocalyptic number.

1066645431 is a deficient number, since it is larger than the sum of its proper divisors (489816905).

1066645431 is a wasteful number, since it uses less digits than its factorization.

1066645431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123 (or 3120 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1066645431 is about 32659.5381320679. The cubic root of 1066645431 is about 1021.7391293582.

The spelling of 1066645431 in words is "one billion, sixty-six million, six hundred forty-five thousand, four hundred thirty-one".