16721764061 has 8 divisors (see below), whose sum is σ = 16741860480. Its totient is φ = 16701683328.

The previous prime is 16721764001. The next prime is 16721764063. The reversal of 16721764061 is 16046712761.

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 16721764061 - 2²⁶ = 16654655197 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 (16721764063) 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, 5275085 + ... + 5278253.

It is an arithmetic number, because the mean of its divisors is an integer number (2092732560).

Almost surely, 2^16721764061 is an apocalyptic number.

It is an amenable number.

16721764061 is a deficient number, since it is larger than the sum of its proper divisors (20096419).

16721764061 is a wasteful number, since it uses less digits than its factorization.

16721764061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7843.

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 16721764061 in words is "sixteen billion, seven hundred twenty-one million, seven hundred sixty-four thousand, sixty-one".