66213044 has 24 divisors (see below), whose sum is σ = 122579520. Its totient is φ = 31230144.

The previous prime is 66213029. The next prime is 66213097. The reversal of 66213044 is 44031266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1787 + ... + 11645.

It is an arithmetic number, because the mean of its divisors is an integer number (5107480).

Almost surely, 2^66213044 is an apocalyptic number.

It is an amenable number.

66213044 is a deficient number, since it is larger than the sum of its proper divisors (56366476).

66213044 is a wasteful number, since it uses less digits than its factorization.

66213044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9959 (or 9957 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 66213044 is about 8137.1397923349. The cubic root of 66213044 is about 404.5583642940.

The spelling of 66213044 in words is "sixty-six million, two hundred thirteen thousand, forty-four".