16456661 has 12 divisors (see below), whose sum is σ = 18534348. Its totient is φ = 14524224.

The previous prime is 16456633. The next prime is 16456667. The reversal of 16456661 is 16665461.

It can be written as a sum of positive squares in 2 ways, for example, as 1168561 + 15288100 = 1081^2 + 3910^2 .

It is not a de Polignac number, because 16456661 - 2⁶ = 16456597 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 (16456667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5681 + ... + 8073.

It is an arithmetic number, because the mean of its divisors is an integer number (1544529).

Almost surely, 2^16456661 is an apocalyptic number.

It is an amenable number.

16456661 is a deficient number, since it is larger than the sum of its proper divisors (2077687).

16456661 is a wasteful number, since it uses less digits than its factorization.

16456661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2452 (or 2429 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 16456661 is about 4056.6810325684. The cubic root of 16456661 is about 254.3590773558.

The spelling of 16456661 in words is "sixteen million, four hundred fifty-six thousand, six hundred sixty-one".