16642505 has 32 divisors (see below), whose sum is σ = 23113728. Its totient is φ = 11390400.

The previous prime is 16642481. The next prime is 16642513. The reversal of 16642505 is 50524661.

It is not a de Polignac number, because 16642505 - 2¹² = 16638409 is a prime.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73202 + ... + 73428.

It is an arithmetic number, because the mean of its divisors is an integer number (722304).

Almost surely, 2^16642505 is an apocalyptic number.

It is an amenable number.

16642505 is a deficient number, since it is larger than the sum of its proper divisors (6471223).

16642505 is a wasteful number, since it uses less digits than its factorization.

16642505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 16642505 is about 4079.5226436435. The cubic root of 16642505 is about 255.3129823479.

The spelling of 16642505 in words is "sixteen million, six hundred forty-two thousand, five hundred five".