66275616 has 48 divisors (see below), whose sum is σ = 189792288. Its totient is φ = 20083200.

The previous prime is 66275611. The next prime is 66275623. The reversal of 66275616 is 61657266.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-3 number, since 3×66275616³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66275611) 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, 30325 + ... + 32436.

It is an arithmetic number, because the mean of its divisors is an integer number (3954006).

Almost surely, 2^66275616 is an apocalyptic number.

66275616 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

66275616 is an abundant number, since it is smaller than the sum of its proper divisors (123516672).

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

66275616 is a wasteful number, since it uses less digits than its factorization.

66275616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62785 (or 62777 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The square root of 66275616 is about 8140.9837243419. The cubic root of 66275616 is about 404.6857614282.

The spelling of 66275616 in words is "sixty-six million, two hundred seventy-five thousand, six hundred sixteen".