16161720213 has 32 divisors (see below), whose sum is σ = 23270117760. Its totient is φ = 9955733760.

The previous prime is 16161720193. The next prime is 16161720217. The reversal of 16161720213 is 31202716161.

It is not a de Polignac number, because 16161720213 - 2⁸ = 16161719957 is a prime.

It is a super-2 number, since 2×16161720213² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16161720217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155206 + ... + 237512.

It is an arithmetic number, because the mean of its divisors is an integer number (727191180).

Almost surely, 2^16161720213 is an apocalyptic number.

It is an amenable number.

16161720213 is a deficient number, since it is larger than the sum of its proper divisors (7108397547).

16161720213 is a wasteful number, since it uses less digits than its factorization.

16161720213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82437.

The product of its (nonzero) digits is 3024, while the sum is 30.

The spelling of 16161720213 in words is "sixteen billion, one hundred sixty-one million, seven hundred twenty thousand, two hundred thirteen".