66351444 has 12 divisors (see below), whose sum is σ = 154820064. Its totient is φ = 22117144.

The previous prime is 66351437. The next prime is 66351463. The reversal of 66351444 is 44415366.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2764632 + ... + 2764655.

It is an arithmetic number, because the mean of its divisors is an integer number (12901672).

Almost surely, 2^66351444 is an apocalyptic number.

It is an amenable number.

66351444 is an abundant number, since it is smaller than the sum of its proper divisors (88468620).

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

66351444 is a wasteful number, since it uses less digits than its factorization.

66351444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5529294 (or 5529292 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

The square root of 66351444 is about 8145.6395697330. The cubic root of 66351444 is about 404.8400404732.

It can be divided in two parts, 66351 and 444, that added together give a triangular number (66795 = T₃₆₅).

The spelling of 66351444 in words is "sixty-six million, three hundred fifty-one thousand, four hundred forty-four".