2221566556 has 48 divisors (see below), whose sum is σ = 4305500640. Its totient is φ = 994590720.

The previous prime is 2221566541. The next prime is 2221566559. The reversal of 2221566556 is 6556651222.

It is a super-2 number, since 2×2221566556² = 9870715925475402272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221566559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 976236 + ... + 978508.

It is an arithmetic number, because the mean of its divisors is an integer number (89697930).

Almost surely, 2^2221566556 is an apocalyptic number.

It is an amenable number.

2221566556 is a deficient number, since it is larger than the sum of its proper divisors (2083934084).

2221566556 is a wasteful number, since it uses less digits than its factorization.

2221566556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614 (or 2612 counting only the distinct ones).

The product of its digits is 216000, while the sum is 40.

The square root of 2221566556 is about 47133.4971755757. The cubic root of 2221566556 is about 1304.8275254413.

The spelling of 2221566556 in words is "two billion, two hundred twenty-one million, five hundred sixty-six thousand, five hundred fifty-six".