2166655601 has 4 divisors (see below), whose sum is σ = 2363624304. Its totient is φ = 1969686900.

The previous prime is 2166655571. The next prime is 2166655649. The reversal of 2166655601 is 1065566612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2166655601 - 2³⁰ = 1092913777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166655651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98484335 + ... + 98484356.

It is an arithmetic number, because the mean of its divisors is an integer number (590906076).

Almost surely, 2^2166655601 is an apocalyptic number.

It is an amenable number.

2166655601 is a deficient number, since it is larger than the sum of its proper divisors (196968703).

2166655601 is a wasteful number, since it uses less digits than its factorization.

2166655601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196968702.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 2166655601 is about 46547.3479480840. The cubic root of 2166655601 is about 1293.9871432049.

The spelling of 2166655601 in words is "two billion, one hundred sixty-six million, six hundred fifty-five thousand, six hundred one".