16099661 has 4 divisors (see below), whose sum is σ = 16113372. Its totient is φ = 16085952.

The previous prime is 16099613. The next prime is 16099667. The reversal of 16099661 is 16699061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16699061 = 409 ⋅40829.

It can be written as a sum of positive squares in 2 ways, for example, as 12075625 + 4024036 = 3475^2 + 2006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16099661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16099667) 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, 4910 + ... + 7503.

It is an arithmetic number, because the mean of its divisors is an integer number (4028343).

Almost surely, 2^16099661 is an apocalyptic number.

It is an amenable number.

16099661 is a deficient number, since it is larger than the sum of its proper divisors (13711).

16099661 is a wasteful number, since it uses less digits than its factorization.

16099661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13710.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 16099661 is about 4012.4382861298. The cubic root of 16099661 is about 252.5063149092.

The spelling of 16099661 in words is "sixteen million, ninety-nine thousand, six hundred sixty-one".