16626961 has 4 divisors (see below), whose sum is σ = 17905972. Its totient is φ = 15347952.

The previous prime is 16626941. The next prime is 16626971. The reversal of 16626961 is 16962661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16962661 = 23 ⋅737507.

It can be written as a sum of positive squares in 2 ways, for example, as 10595025 + 6031936 = 3255^2 + 2456^2 .

It is a cyclic number.

It is not a de Polignac number, because 16626961 - 2¹¹ = 16624913 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 16626961.

It is not an unprimeable number, because it can be changed into a prime (16626941) 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, 639486 + ... + 639511.

It is an arithmetic number, because the mean of its divisors is an integer number (4476493).

Almost surely, 2^16626961 is an apocalyptic number.

It is an amenable number.

16626961 is a deficient number, since it is larger than the sum of its proper divisors (1279011).

16626961 is a wasteful number, since it uses less digits than its factorization.

16626961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279010.

The product of its digits is 23328, while the sum is 37.

The square root of 16626961 is about 4077.6170737331. The cubic root of 16626961 is about 255.2334706561.

The spelling of 16626961 in words is "sixteen million, six hundred twenty-six thousand, nine hundred sixty-one".