16653401 has 4 divisors (see below), whose sum is σ = 16726992. Its totient is φ = 16579812.

The previous prime is 16653397. The next prime is 16653419. The reversal of 16653401 is 10435661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16653401 - 2² = 16653397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16653431) 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, 36455 + ... + 36908.

It is an arithmetic number, because the mean of its divisors is an integer number (4181748).

Almost surely, 2^16653401 is an apocalyptic number.

It is an amenable number.

16653401 is a deficient number, since it is larger than the sum of its proper divisors (73591).

16653401 is an equidigital number, since it uses as much as digits as its factorization.

16653401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73590.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 16653401 is about 4080.8578754963. The cubic root of 16653401 is about 255.3686887728.

It can be divided in two parts, 1665 and 3401, that multiplied together give a palindrome (5662665).

The spelling of 16653401 in words is "sixteen million, six hundred fifty-three thousand, four hundred one".