66544242 has 16 divisors (see below), whose sum is σ = 133217760. Its totient is φ = 22159872.

The previous prime is 66544237. The next prime is 66544279. The reversal of 66544242 is 24244566.

It is a super-2 number, since 2×66544242² = 8856272286709128, which contains 22 as substring.

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, 2109 + ... + 11727.

It is an arithmetic number, because the mean of its divisors is an integer number (8326110).

Almost surely, 2^66544242 is an apocalyptic number.

66544242 is an abundant number, since it is smaller than the sum of its proper divisors (66673518).

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

66544242 is a wasteful number, since it uses less digits than its factorization.

66544242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10777.

The product of its digits is 46080, while the sum is 33.

The square root of 66544242 is about 8157.4654151887. The cubic root of 66544242 is about 405.2317771010.

The spelling of 66544242 in words is "sixty-six million, five hundred forty-four thousand, two hundred forty-two".