2164945557 has 16 divisors (see below), whose sum is σ = 3040002560. Its totient is φ = 1366666992.

The previous prime is 2164945511. The next prime is 2164945577. The reversal of 2164945557 is 7555494612.

It is not a de Polignac number, because 2164945557 - 2⁶ = 2164945493 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164945507) 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, 125688 + ... + 141870.

It is an arithmetic number, because the mean of its divisors is an integer number (190000160).

Almost surely, 2^2164945557 is an apocalyptic number.

It is an amenable number.

2164945557 is a deficient number, since it is larger than the sum of its proper divisors (875057003).

2164945557 is a wasteful number, since it uses less digits than its factorization.

2164945557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18552.

The product of its digits is 1512000, while the sum is 48.

The square root of 2164945557 is about 46528.9754561606. The cubic root of 2164945557 is about 1293.6466249498.

The spelling of 2164945557 in words is "two billion, one hundred sixty-four million, nine hundred forty-five thousand, five hundred fifty-seven".