66499884 has 72 divisors (see below), whose sum is σ = 184312128. Its totient is φ = 20049120.

The previous prime is 66499879. The next prime is 66499889. The reversal of 66499884 is 48899466.

It is an interprime number because it is at equal distance from previous prime (66499879) and next prime (66499889).

It is a self number, because there is not a number n which added to its sum of digits gives 66499884.

It is not an unprimeable number, because it can be changed into a prime (66499889) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121299 + ... + 121845.

Almost surely, 2^66499884 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 66499884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92156064).

66499884 is an abundant number, since it is smaller than the sum of its proper divisors (117812244).

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

66499884 is a wasteful number, since it uses less digits than its factorization.

66499884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875 (or 870 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 66499884 is about 8154.7461027306. The cubic root of 66499884 is about 405.1417153808.

The spelling of 66499884 in words is "sixty-six million, four hundred ninety-nine thousand, eight hundred eighty-four".