66616254 has 12 divisors (see below), whose sum is σ = 144335256. Its totient is φ = 22205412.

The previous prime is 66616201. The next prime is 66616259. The reversal of 66616254 is 45261666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66616259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1850434 + ... + 1850469.

It is an arithmetic number, because the mean of its divisors is an integer number (12027938).

Almost surely, 2^66616254 is an apocalyptic number.

66616254 is an abundant number, since it is smaller than the sum of its proper divisors (77719002).

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

66616254 is a wasteful number, since it uses less digits than its factorization.

66616254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700911 (or 3700908 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 66616254 is about 8161.8780926941. The cubic root of 66616254 is about 405.3779005909.

The spelling of 66616254 in words is "sixty-six million, six hundred sixteen thousand, two hundred fifty-four".