66457700 has 36 divisors (see below), whose sum is σ = 145584432. Its totient is φ = 26330400.

The previous prime is 66457693. The next prime is 66457751. The reversal of 66457700 is 775466.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7595 + ... + 13805.

It is an arithmetic number, because the mean of its divisors is an integer number (4044012).

Almost surely, 2^66457700 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 66457700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72792216).

66457700 is an abundant number, since it is smaller than the sum of its proper divisors (79126732).

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

66457700 is a wasteful number, since it uses less digits than its factorization.

66457700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6332 (or 6325 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 66457700 is about 8152.1592231752. The cubic root of 66457700 is about 405.0560304536.

The spelling of 66457700 in words is "sixty-six million, four hundred fifty-seven thousand, seven hundred".