2163877661 has 8 divisors (see below), whose sum is σ = 2361560448. Its totient is φ = 1966356000.

The previous prime is 2163877633. The next prime is 2163877669. The reversal of 2163877661 is 1667783612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2163877661 - 2¹⁴ = 2163861277 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 (2163877669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11285 + ... + 66746.

It is an arithmetic number, because the mean of its divisors is an integer number (295195056).

Almost surely, 2^2163877661 is an apocalyptic number.

It is an amenable number.

2163877661 is a deficient number, since it is larger than the sum of its proper divisors (197682787).

2163877661 is a wasteful number, since it uses less digits than its factorization.

2163877661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80563.

The product of its digits is 508032, while the sum is 47.

The square root of 2163877661 is about 46517.4984387596. The cubic root of 2163877661 is about 1293.4338856102.

It can be divided in two parts, 21638 and 77661, that added together give a palindrome (99299).

The spelling of 2163877661 in words is "two billion, one hundred sixty-three million, eight hundred seventy-seven thousand, six hundred sixty-one".