66409596 has 72 divisors (see below), whose sum is σ = 185937024. Its totient is φ = 19815840.

The previous prime is 66409591. The next prime is 66409597. The reversal of 66409596 is 69590466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66409591) 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, 25281 + ... + 27783.

Almost surely, 2^66409596 is an apocalyptic number.

66409596 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66409596, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92968512).

66409596 is an abundant number, since it is smaller than the sum of its proper divisors (119527428).

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

66409596 is a wasteful number, since it uses less digits than its factorization.

66409596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591 (or 2586 counting only the distinct ones).

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

The square root of 66409596 is about 8149.2083051055. The cubic root of 66409596 is about 404.9582764516.

The spelling of 66409596 in words is "sixty-six million, four hundred nine thousand, five hundred ninety-six".