2881991066 has 4 divisors (see below), whose sum is σ = 4322986602. Its totient is φ = 1440995532.

The previous prime is 2881991059. The next prime is 2881991129. The reversal of 2881991066 is 6601991882.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1652016025 + 1229975041 = 40645^2 + 35071^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720497765 + ... + 720497768.

Almost surely, 2^2881991066 is an apocalyptic number.

2881991066 is a deficient number, since it is larger than the sum of its proper divisors (1440995536).

2881991066 is a wasteful number, since it uses less digits than its factorization.

2881991066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440995535.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 2881991066 is about 53684.1789170702. The cubic root of 2881991066 is about 1423.0851170701.

The spelling of 2881991066 in words is "two billion, eight hundred eighty-one million, nine hundred ninety-one thousand, sixty-six".