2170664557 has 4 divisors (see below), whose sum is σ = 2284910080. Its totient is φ = 2056419036.

The previous prime is 2170664549. The next prime is 2170664621. The reversal of 2170664557 is 7554660712.

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 2170664557 - 2³ = 2170664549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2170664527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57122733 + ... + 57122770.

It is an arithmetic number, because the mean of its divisors is an integer number (571227520).

Almost surely, 2^2170664557 is an apocalyptic number.

It is an amenable number.

2170664557 is a deficient number, since it is larger than the sum of its proper divisors (114245523).

2170664557 is a wasteful number, since it uses less digits than its factorization.

2170664557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114245522.

The product of its (nonzero) digits is 352800, while the sum is 43.

The square root of 2170664557 is about 46590.3912518451. The cubic root of 2170664557 is about 1294.7847382494.

The spelling of 2170664557 in words is "two billion, one hundred seventy million, six hundred sixty-four thousand, five hundred fifty-seven".