2156647566 has 8 divisors (see below), whose sum is σ = 4313295144. Its totient is φ = 718882520.

The previous prime is 2156647547. The next prime is 2156647567. The reversal of 2156647566 is 6657466512.

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

2156647566 is an admirable number.

It is a super-2 number, since 2×2156647566² = 9302257447867448712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156647567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179720625 + ... + 179720636.

It is an arithmetic number, because the mean of its divisors is an integer number (539161893).

Almost surely, 2^2156647566 is an apocalyptic number.

2156647566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156647566 is a wasteful number, since it uses less digits than its factorization.

2156647566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359441266.

The product of its digits is 1814400, while the sum is 48.

The square root of 2156647566 is about 46439.7197019965. The cubic root of 2156647566 is about 1291.9917084682.

The spelling of 2156647566 in words is "two billion, one hundred fifty-six million, six hundred forty-seven thousand, five hundred sixty-six".