16161604671 has 4 divisors (see below), whose sum is σ = 21548806232. Its totient is φ = 10774403112.

The previous prime is 16161604633. The next prime is 16161604681. The reversal of 16161604671 is 17640616161.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16161604671 - 2⁹ = 16161604159 is a prime.

It is a super-2 number, since 2×16161604671² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16161604601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2693600776 + ... + 2693600781.

It is an arithmetic number, because the mean of its divisors is an integer number (5387201558).

Almost surely, 2^16161604671 is an apocalyptic number.

16161604671 is a deficient number, since it is larger than the sum of its proper divisors (5387201561).

16161604671 is an equidigital number, since it uses as much as digits as its factorization.

16161604671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5387201560.

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 16161604671 in words is "sixteen billion, one hundred sixty-one million, six hundred four thousand, six hundred seventy-one".