2166156553 has 8 divisors (see below), whose sum is σ = 2364606720. Its totient is φ = 1967960880.

The previous prime is 2166156547. The next prime is 2166156599. The reversal of 2166156553 is 3556516612.

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

It is a cyclic number.

It is not a de Polignac number, because 2166156553 - 2¹⁷ = 2166025481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166156533) 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 7 ways as a sum of consecutive naturals, for example, 45598 + ... + 80071.

It is an arithmetic number, because the mean of its divisors is an integer number (295575840).

Almost surely, 2^2166156553 is an apocalyptic number.

It is an amenable number.

2166156553 is a deficient number, since it is larger than the sum of its proper divisors (198450167).

2166156553 is a wasteful number, since it uses less digits than its factorization.

2166156553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127247.

The product of its digits is 162000, while the sum is 40.

The square root of 2166156553 is about 46541.9869902436. The cubic root of 2166156553 is about 1293.8877871156.

The spelling of 2166156553 in words is "two billion, one hundred sixty-six million, one hundred fifty-six thousand, five hundred fifty-three".