66012416 has 18 divisors (see below), whose sum is σ = 131767482. Its totient is φ = 33006080.

The previous prime is 66012413. The next prime is 66012433. The reversal of 66012416 is 61421066.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 42198016 + 23814400 = 6496^2 + 4880^2 .

It is a super-3 number, since 3×66012416³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66012413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128675 + ... + 129186.

Almost surely, 2^66012416 is an apocalyptic number.

It is an amenable number.

66012416 is a deficient number, since it is larger than the sum of its proper divisors (65755066).

66012416 is an equidigital number, since it uses as much as digits as its factorization.

66012416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257877 (or 257863 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 66012416 is about 8124.8025206770. The cubic root of 66012416 is about 404.1493419057.

The spelling of 66012416 in words is "sixty-six million, twelve thousand, four hundred sixteen".