1721016685 has 8 divisors (see below), whose sum is σ = 2080078560. Its totient is φ = 1366907664.

The previous prime is 1721016679. The next prime is 1721016701. The reversal of 1721016685 is 5866101271.

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 1721016685 - 2¹¹ = 1721014637 is a prime.

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, 1237447 + ... + 1238836.

It is an arithmetic number, because the mean of its divisors is an integer number (260009820).

Almost surely, 2^1721016685 is an apocalyptic number.

It is an amenable number.

1721016685 is a deficient number, since it is larger than the sum of its proper divisors (359061875).

1721016685 is a wasteful number, since it uses less digits than its factorization.

1721016685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2476427.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 1721016685 is about 41485.1381219829. The cubic root of 1721016685 is about 1198.3813094139.

The spelling of 1721016685 in words is "one billion, seven hundred twenty-one million, sixteen thousand, six hundred eighty-five".