66616446 has 32 divisors (see below), whose sum is σ = 143861760. Its totient is φ = 20443104.

The previous prime is 66616439. The next prime is 66616447. The reversal of 66616446 is 64461666.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66616447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36471 + ... + 38253.

It is an arithmetic number, because the mean of its divisors is an integer number (4495680).

Almost surely, 2^66616446 is an apocalyptic number.

66616446 is an abundant number, since it is smaller than the sum of its proper divisors (77245314).

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

66616446 is a wasteful number, since it uses less digits than its factorization.

66616446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280.

The product of its digits is 124416, while the sum is 39.

The square root of 66616446 is about 8161.8898546844. The cubic root of 66616446 is about 405.3782900478.

The spelling of 66616446 in words is "sixty-six million, six hundred sixteen thousand, four hundred forty-six".