16161720211 has 8 divisors (see below), whose sum is σ = 19891348064. Its totient is φ = 12787295040.

The previous prime is 16161720193. The next prime is 16161720217. The reversal of 16161720211 is 11202716161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16161720211 - 2⁷ = 16161720083 is a prime.

It is a super-2 number, since 2×16161720211² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16161720211.

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 7 ways as a sum of consecutive naturals, for example, 88800570 + ... + 88800751.

It is an arithmetic number, because the mean of its divisors is an integer number (2486418508).

Almost surely, 2^16161720211 is an apocalyptic number.

16161720211 is a deficient number, since it is larger than the sum of its proper divisors (3729627853).

16161720211 is a wasteful number, since it uses less digits than its factorization.

16161720211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177601341.

The product of its (nonzero) digits is 1008, while the sum is 28.

The spelling of 16161720211 in words is "sixteen billion, one hundred sixty-one million, seven hundred twenty thousand, two hundred eleven".