2164953779 has 4 divisors (see below), whose sum is σ = 2184112776. Its totient is φ = 2145794784.

The previous prime is 2164953743. The next prime is 2164953811. The reversal of 2164953779 is 9773594612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2164953779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2164953779.

It is not an unprimeable number, because it can be changed into a prime (2164953979) 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, 9579329 + ... + 9579554.

It is an arithmetic number, because the mean of its divisors is an integer number (546028194).

Almost surely, 2^2164953779 is an apocalyptic number.

2164953779 is a deficient number, since it is larger than the sum of its proper divisors (19158997).

2164953779 is a wasteful number, since it uses less digits than its factorization.

2164953779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19158996.

The product of its digits is 2857680, while the sum is 53.

The square root of 2164953779 is about 46529.0638096233. The cubic root of 2164953779 is about 1293.6482626121.

The spelling of 2164953779 in words is "two billion, one hundred sixty-four million, nine hundred fifty-three thousand, seven hundred seventy-nine".