66903616 has 56 divisors (see below), whose sum is σ = 144622520. Its totient is φ = 30523392.

The previous prime is 66903593. The next prime is 66903647. The reversal of 66903616 is 61630966.

It can be written as a sum of positive squares in 4 ways, for example, as 2903616 + 64000000 = 1704^2 + 8000^2 .

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, 80290 + ... + 81118.

It is an arithmetic number, because the mean of its divisors is an integer number (2582545).

Almost surely, 2^66903616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66903616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72311260).

66903616 is an abundant number, since it is smaller than the sum of its proper divisors (77718904).

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

66903616 is a wasteful number, since it uses less digits than its factorization.

66903616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951 (or 941 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 66903616 is about 8179.4630630623. The cubic root of 66903616 is about 405.9599562535.

The spelling of 66903616 in words is "sixty-six million, nine hundred three thousand, six hundred sixteen".