16709661 has 24 divisors (see below), whose sum is σ = 25496640. Its totient is φ = 10524096.

The previous prime is 16709659. The next prime is 16709663. The reversal of 16709661 is 16690761.

It is an interprime number because it is at equal distance from previous prime (16709659) and next prime (16709663).

It is not a de Polignac number, because 16709661 - 2¹ = 16709659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16709663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17970 + ... + 18876.

It is an arithmetic number, because the mean of its divisors is an integer number (1062360).

Almost surely, 2^16709661 is an apocalyptic number.

It is an amenable number.

16709661 is a deficient number, since it is larger than the sum of its proper divisors (8786979).

16709661 is a wasteful number, since it uses less digits than its factorization.

16709661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025 (or 1022 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 16709661 is about 4087.7452220020. The cubic root of 16709661 is about 255.6559352849.

The spelling of 16709661 in words is "sixteen million, seven hundred nine thousand, six hundred sixty-one".