16200661 has 4 divisors (see below), whose sum is σ = 16319052. Its totient is φ = 16082272.

The previous prime is 16200641. The next prime is 16200713. The reversal of 16200661 is 16600261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9492561 + 6708100 = 3081^2 + 2590^2 .

It is a cyclic number.

It is not a de Polignac number, because 16200661 - 2⁵ = 16200629 is a prime.

It is a super-2 number, since 2×16200661² = 524922833673842, which 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 (16200641) 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, 58990 + ... + 59263.

It is an arithmetic number, because the mean of its divisors is an integer number (4079763).

Almost surely, 2^16200661 is an apocalyptic number.

It is an amenable number.

16200661 is a deficient number, since it is larger than the sum of its proper divisors (118391).

16200661 is a wasteful number, since it uses less digits than its factorization.

16200661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118390.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 16200661 is about 4025.0044720472. The cubic root of 16200661 is about 253.0332409572.

It can be divided in two parts, 16200 and 661, that added together give a palindrome (16861).

The spelling of 16200661 in words is "sixteen million, two hundred thousand, six hundred sixty-one".