1066317591 has 8 divisors (see below), whose sum is σ = 1424608000. Its totient is φ = 709452792.

The previous prime is 1066317557. The next prime is 1066317613. The reversal of 1066317591 is 1957136601.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1066317591 - 2¹⁰ = 1066316567 is a prime.

It is a super-2 number, since 2×1066317591² = 2274066409752086562, 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 (1066317691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354655 + ... + 357648.

It is an arithmetic number, because the mean of its divisors is an integer number (178076000).

Almost surely, 2^1066317591 is an apocalyptic number.

1066317591 is a deficient number, since it is larger than the sum of its proper divisors (358290409).

1066317591 is an equidigital number, since it uses as much as digits as its factorization.

1066317591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712805.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 1066317591 is about 32654.5186919054. The cubic root of 1066317591 is about 1021.6344393740.

The spelling of 1066317591 in words is "one billion, sixty-six million, three hundred seventeen thousand, five hundred ninety-one".