16640253 has 36 divisors (see below), whose sum is σ = 28321020. Its totient is φ = 9386496.

The previous prime is 16640249. The next prime is 16640317. The reversal of 16640253 is 35204661.

16640253 is a `hidden beast` number, since 16 + 640 + 2 + 5 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5631129 + 11009124 = 2373^2 + 3318^2 .

It is not a de Polignac number, because 16640253 - 2² = 16640249 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640233) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 42583 + ... + 42971.

It is an arithmetic number, because the mean of its divisors is an integer number (786695).

Almost surely, 2^16640253 is an apocalyptic number.

It is an amenable number.

16640253 is a deficient number, since it is larger than the sum of its proper divisors (11680767).

16640253 is a wasteful number, since it uses less digits than its factorization.

16640253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 16640253 is about 4079.2466216202. The cubic root of 16640253 is about 255.3014658369.

The spelling of 16640253 in words is "sixteen million, six hundred forty thousand, two hundred fifty-three".