66396512 has 72 divisors (see below), whose sum is σ = 161956368. Its totient is φ = 26092800.

The previous prime is 66396511. The next prime is 66396541. The reversal of 66396512 is 21569366.

It is a super-2 number, since 2×66396512² = 8816993611532288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66396511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 439637 + ... + 439787.

It is an arithmetic number, because the mean of its divisors is an integer number (2249394).

Almost surely, 2^66396512 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 66396512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80978184).

66396512 is an abundant number, since it is smaller than the sum of its proper divisors (95559856).

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

66396512 is a wasteful number, since it uses less digits than its factorization.

66396512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 173 counting only the distinct ones).

The product of its digits is 58320, while the sum is 38.

The square root of 66396512 is about 8148.4054881922. The cubic root of 66396512 is about 404.9316797828.

The spelling of 66396512 in words is "sixty-six million, three hundred ninety-six thousand, five hundred twelve".