66420160 has 28 divisors (see below), whose sum is σ = 158163768. Its totient is φ = 26567936.

The previous prime is 66420149. The next prime is 66420161. The reversal of 66420160 is 6102466.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66420161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103462 + ... + 104101.

It is an arithmetic number, because the mean of its divisors is an integer number (5648706).

Almost surely, 2^66420160 is an apocalyptic number.

It is an amenable number.

66420160 is an abundant number, since it is smaller than the sum of its proper divisors (91743608).

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

66420160 is a wasteful number, since it uses less digits than its factorization.

66420160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207580 (or 207570 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 66420160 is about 8149.8564404534. The cubic root of 66420160 is about 404.9797480093.

The spelling of 66420160 in words is "sixty-six million, four hundred twenty thousand, one hundred sixty".