1066580387 has 4 divisors (see below), whose sum is σ = 1076548536. Its totient is φ = 1056612240.

The previous prime is 1066580381. The next prime is 1066580401. The reversal of 1066580387 is 7830856601.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1066580387 - 2¹⁶ = 1066514851 is a prime.

It is a super-2 number, since 2×1066580387² = 2275187443866139538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066580381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4983914 + ... + 4984127.

It is an arithmetic number, because the mean of its divisors is an integer number (269137134).

Almost surely, 2^1066580387 is an apocalyptic number.

1066580387 is a deficient number, since it is larger than the sum of its proper divisors (9968149).

1066580387 is an equidigital number, since it uses as much as digits as its factorization.

1066580387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9968148.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 1066580387 is about 32658.5423281567. The cubic root of 1066580387 is about 1021.7183603976.

The spelling of 1066580387 in words is "one billion, sixty-six million, five hundred eighty thousand, three hundred eighty-seven".