2201661638 has 16 divisors (see below), whose sum is σ = 3608755200. Its totient is φ = 999078600.

The previous prime is 2201661629. The next prime is 2201661661. The reversal of 2201661638 is 8361661022.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2201661598 and 2201661607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70358 + ... + 96713.

It is an arithmetic number, because the mean of its divisors is an integer number (225547200).

Almost surely, 2^2201661638 is an apocalyptic number.

2201661638 is a deficient number, since it is larger than the sum of its proper divisors (1407093562).

2201661638 is a wasteful number, since it uses less digits than its factorization.

2201661638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167683.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 2201661638 is about 46921.8673754573. The cubic root of 2201661638 is about 1300.9188056862.

The spelling of 2201661638 in words is "two billion, two hundred one million, six hundred sixty-one thousand, six hundred thirty-eight".