16540651 has 4 divisors (see below), whose sum is σ = 16556904. Its totient is φ = 16524400.

The previous prime is 16540633. The next prime is 16540661. The reversal of 16540651 is 15604561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16540651 - 2⁵ = 16540619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16540631) 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, 6490 + ... + 8671.

It is an arithmetic number, because the mean of its divisors is an integer number (4139226).

Almost surely, 2^16540651 is an apocalyptic number.

16540651 is a deficient number, since it is larger than the sum of its proper divisors (16253).

16540651 is a wasteful number, since it uses less digits than its factorization.

16540651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16252.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 16540651 is about 4067.0199163515. The cubic root of 16540651 is about 254.7910681273.

The spelling of 16540651 in words is "sixteen million, five hundred forty thousand, six hundred fifty-one".