66520444 has 12 divisors (see below), whose sum is σ = 122537800. Its totient is φ = 31509648.

The previous prime is 66520427. The next prime is 66520471. The reversal of 66520444 is 44402566.

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, 437559 + ... + 437710.

Almost surely, 2^66520444 is an apocalyptic number.

It is an amenable number.

66520444 is a deficient number, since it is larger than the sum of its proper divisors (56017356).

66520444 is a wasteful number, since it uses less digits than its factorization.

66520444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875292 (or 875290 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 66520444 is about 8156.0066208899. The cubic root of 66520444 is about 405.1834641021.

The spelling of 66520444 in words is "sixty-six million, five hundred twenty thousand, four hundred forty-four".