66532518 has 48 divisors (see below), whose sum is σ = 156317616. Its totient is φ = 20329920.

The previous prime is 66532511. The next prime is 66532519. The reversal of 66532518 is 81523566.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66532511) 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, 35833 + ... + 37643.

It is an arithmetic number, because the mean of its divisors is an integer number (3256617).

Almost surely, 2^66532518 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66532518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78158808).

66532518 is an abundant number, since it is smaller than the sum of its proper divisors (89785098).

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

66532518 is a wasteful number, since it uses less digits than its factorization.

66532518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989 (or 1986 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 66532518 is about 8156.7467779747. The cubic root of 66532518 is about 405.2079773138.

The spelling of 66532518 in words is "sixty-six million, five hundred thirty-two thousand, five hundred eighteen".