1721661104 has 20 divisors (see below), whose sum is σ = 3366324720. Its totient is φ = 852932160.

The previous prime is 1721661101. The next prime is 1721661157. The reversal of 1721661104 is 4011661271.

It is not an unprimeable number, because it can be changed into a prime (1721661101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491852 + ... + 495339.

It is an arithmetic number, because the mean of its divisors is an integer number (168316236).

Almost surely, 2^1721661104 is an apocalyptic number.

It is an amenable number.

1721661104 is a deficient number, since it is larger than the sum of its proper divisors (1644663616).

1721661104 is a wasteful number, since it uses less digits than its factorization.

1721661104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987308 (or 987302 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1721661104 is about 41492.9042608492. The cubic root of 1721661104 is about 1198.5308650658.

The spelling of 1721661104 in words is "one billion, seven hundred twenty-one million, six hundred sixty-one thousand, one hundred four".