1066858791 has 4 divisors (see below), whose sum is σ = 1422478392. Its totient is φ = 711239192.

The previous prime is 1066858789. The next prime is 1066858799. The reversal of 1066858791 is 1978586601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1978586601 = 3 ⋅659528867.

It is a cyclic number.

It is not a de Polignac number, because 1066858791 - 2¹ = 1066858789 is a prime.

It is a super-2 number, since 2×1066858791² = 2276375359867963362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066858799) 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, 177809796 + ... + 177809801.

It is an arithmetic number, because the mean of its divisors is an integer number (355619598).

Almost surely, 2^1066858791 is an apocalyptic number.

1066858791 is a deficient number, since it is larger than the sum of its proper divisors (355619601).

1066858791 is an equidigital number, since it uses as much as digits as its factorization.

1066858791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355619600.

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 1066858791 is about 32662.8043958261. The cubic root of 1066858791 is about 1021.8072506291.

The spelling of 1066858791 in words is "one billion, sixty-six million, eight hundred fifty-eight thousand, seven hundred ninety-one".