66353880 has 64 divisors (see below), whose sum is σ = 202836960. Its totient is φ = 17358848.

The previous prime is 66353863. The next prime is 66353887. The reversal of 66353880 is 8835366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66353887) 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, 1144 + ... + 11576.

Almost surely, 2^66353880 is an apocalyptic number.

66353880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66353880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101418480).

66353880 is an abundant number, since it is smaller than the sum of its proper divisors (136483080).

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

66353880 is a wasteful number, since it uses less digits than its factorization.

66353880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500 (or 10496 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 66353880 is about 8145.7890962141. The cubic root of 66353880 is about 404.8449947902.

The spelling of 66353880 in words is "sixty-six million, three hundred fifty-three thousand, eight hundred eighty".