66541404 has 12 divisors (see below), whose sum is σ = 155263304. Its totient is φ = 22180464.

The previous prime is 66541403. The next prime is 66541493. The reversal of 66541404 is 40414566.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66541403) 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, 2772547 + ... + 2772570.

Almost surely, 2^66541404 is an apocalyptic number.

It is an amenable number.

66541404 is an abundant number, since it is smaller than the sum of its proper divisors (88721900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66541404 is a wasteful number, since it uses less digits than its factorization.

66541404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5545124 (or 5545122 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 66541404 is about 8157.2914622441. The cubic root of 66541404 is about 405.2260162012.

The spelling of 66541404 in words is "sixty-six million, five hundred forty-one thousand, four hundred four".