66885654 has 48 divisors (see below), whose sum is σ = 148140720. Its totient is φ = 20116800.

The previous prime is 66885619. The next prime is 66885659. The reversal of 66885654 is 45658866.

It is a happy number.

It is a super-2 number, since 2×66885654² = 8947381422015432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66885659) 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, 131152 + ... + 131660.

It is an arithmetic number, because the mean of its divisors is an integer number (3086265).

Almost surely, 2^66885654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66885654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74070360).

66885654 is an abundant number, since it is smaller than the sum of its proper divisors (81255066).

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

66885654 is a wasteful number, since it uses less digits than its factorization.

66885654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717 (or 706 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 48.

The square root of 66885654 is about 8178.3649955232. The cubic root of 66885654 is about 405.9236228641.

The spelling of 66885654 in words is "sixty-six million, eight hundred eighty-five thousand, six hundred fifty-four".