66499056 has 100 divisors (see below), whose sum is σ = 207325272. Its totient is φ = 20456064.

The previous prime is 66499051. The next prime is 66499067. The reversal of 66499056 is 65099466.

It is a super-2 number, since 2×66499056² = 8844248897782272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66499051) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14875 + ... + 18821.

Almost surely, 2^66499056 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 66499056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103662636).

66499056 is an abundant number, since it is smaller than the sum of its proper divisors (140826216).

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

66499056 is a wasteful number, since it uses less digits than its factorization.

66499056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3980 (or 3965 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 66499056 is about 8154.6953345910. The cubic root of 66499056 is about 405.1400338805.

The spelling of 66499056 in words is "sixty-six million, four hundred ninety-nine thousand, fifty-six".