16013661 has 8 divisors (see below), whose sum is σ = 21431424. Its totient is φ = 10635840.

The previous prime is 16013653. The next prime is 16013663. The reversal of 16013661 is 16631061.

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

It is not a de Polignac number, because 16013661 - 2³ = 16013653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16013663) 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, 9036 + ... + 10661.

It is an arithmetic number, because the mean of its divisors is an integer number (2678928).

Almost surely, 2^16013661 is an apocalyptic number.

It is an amenable number.

16013661 is a deficient number, since it is larger than the sum of its proper divisors (5417763).

16013661 is a wasteful number, since it uses less digits than its factorization.

16013661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19971.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 16013661 is about 4001.7072606576. The cubic root of 16013661 is about 252.0559053341.

The spelling of 16013661 in words is "sixteen million, thirteen thousand, six hundred sixty-one".