2000655721 has 16 divisors (see below), whose sum is σ = 2128654080. Its totient is φ = 1877845120.

The previous prime is 2000655707. The next prime is 2000655733. The reversal of 2000655721 is 1275560002.

It is a cyclic number.

It is not a de Polignac number, because 2000655721 - 2⁵ = 2000655689 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 2000655721.

It is not an unprimeable number, because it can be changed into a prime (2000655121) 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, 104895 + ... + 122491.

It is an arithmetic number, because the mean of its divisors is an integer number (133040880).

Almost surely, 2^2000655721 is an apocalyptic number.

It is an amenable number.

2000655721 is a deficient number, since it is larger than the sum of its proper divisors (127998359).

2000655721 is a wasteful number, since it uses less digits than its factorization.

2000655721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17744.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 2000655721 is about 44728.6901328443. The cubic root of 2000655721 is about 1260.0587276314.

It can be divided in two parts, 2000 and 655721, that added together give a square (657721 = 811²).

The spelling of 2000655721 in words is "two billion, six hundred fifty-five thousand, seven hundred twenty-one".