1516221566 has 8 divisors (see below), whose sum is σ = 2274497904. Its totient is φ = 758055600.

The previous prime is 1516221547. The next prime is 1516221661. The reversal of 1516221566 is 6651226151.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36911 + ... + 66293.

It is an arithmetic number, because the mean of its divisors is an integer number (284312238).

Almost surely, 2^1516221566 is an apocalyptic number.

1516221566 is a deficient number, since it is larger than the sum of its proper divisors (758276338).

1516221566 is a wasteful number, since it uses less digits than its factorization.

1516221566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55186.

The product of its digits is 21600, while the sum is 35.

The square root of 1516221566 is about 38938.6898341482. The cubic root of 1516221566 is about 1148.8259135137.

The spelling of 1516221566 in words is "one billion, five hundred sixteen million, two hundred twenty-one thousand, five hundred sixty-six".