66855936 has 88 divisors (see below), whose sum is σ = 203717440. Its totient is φ = 19095552.

The previous prime is 66855931. The next prime is 66855937. The reversal of 66855936 is 63955866.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (66855931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19950 + ... + 23058.

Almost surely, 2^66855936 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 66855936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101858720).

66855936 is an abundant number, since it is smaller than the sum of its proper divisors (136861504).

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

66855936 is a wasteful number, since it uses less digits than its factorization.

66855936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3139 (or 3121 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 48.

The square root of 66855936 is about 8176.5479268454. The cubic root of 66855936 is about 405.8634952455.

It can be divided in two parts, 6685 and 5936, that added together give a palindrome (12621).

The spelling of 66855936 in words is "sixty-six million, eight hundred fifty-five thousand, nine hundred thirty-six".