7121885566 has 16 divisors (see below), whose sum is σ = 10964455488. Its totient is φ = 3467401600.

The previous prime is 7121885557. The next prime is 7121885579. The reversal of 7121885566 is 6655881217.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40630 + ... + 126073.

It is an arithmetic number, because the mean of its divisors is an integer number (685278468).

Almost surely, 2^7121885566 is an apocalyptic number.

7121885566 is a deficient number, since it is larger than the sum of its proper divisors (3842569922).

7121885566 is a wasteful number, since it uses less digits than its factorization.

7121885566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167267.

The product of its digits is 806400, while the sum is 49.

The square root of 7121885566 is about 84391.2647493803. The cubic root of 7121885566 is about 1923.9701527823.

The spelling of 7121885566 in words is "seven billion, one hundred twenty-one million, eight hundred eighty-five thousand, five hundred sixty-six".