2164662261 has 12 divisors (see below), whose sum is σ = 3127203040. Its totient is φ = 1442891880.

The previous prime is 2164662257. The next prime is 2164662277. The reversal of 2164662261 is 1622664612.

2164662261 is a `hidden beast` number, since 2 + 1 + 646 + 6 + 2 + 2 + 6 + 1 = 666.

It is not a de Polignac number, because 2164662261 - 2² = 2164662257 is a prime.

It is a super-3 number, since 3×2164662261³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164662251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65946 + ... + 93156.

Almost surely, 2^2164662261 is an apocalyptic number.

It is an amenable number.

2164662261 is a deficient number, since it is larger than the sum of its proper divisors (962540779).

2164662261 is a wasteful number, since it uses less digits than its factorization.

2164662261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36056 (or 36053 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 2164662261 is about 46525.9310600014. The cubic root of 2164662261 is about 1293.5901953705.

The spelling of 2164662261 in words is "two billion, one hundred sixty-four million, six hundred sixty-two thousand, two hundred sixty-one".