66469518 has 64 divisors (see below), whose sum is σ = 155289600. Its totient is φ = 21047040.

The previous prime is 66469463. The next prime is 66469519. The reversal of 66469518 is 81596466.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

Its product of digits (311040) is a multiple of the sum of its prime divisors (768).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66469519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98430 + ... + 99102.

It is an arithmetic number, because the mean of its divisors is an integer number (2426400).

Almost surely, 2^66469518 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66469518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77644800).

66469518 is an abundant number, since it is smaller than the sum of its proper divisors (88820082).

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

66469518 is a wasteful number, since it uses less digits than its factorization.

66469518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774 (or 768 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 66469518 is about 8152.8840295935. The cubic root of 66469518 is about 405.0800390507.

The spelling of 66469518 in words is "sixty-six million, four hundred sixty-nine thousand, five hundred eighteen".