66420718 has 48 divisors (see below), whose sum is σ = 125435520. Its totient is φ = 25822368.

The previous prime is 66420703. The next prime is 66420719. The reversal of 66420718 is 81702466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66420719) 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, 158313 + ... + 158731.

It is an arithmetic number, because the mean of its divisors is an integer number (2613240).

Almost surely, 2^66420718 is an apocalyptic number.

66420718 is a deficient number, since it is larger than the sum of its proper divisors (59014802).

66420718 is a wasteful number, since it uses less digits than its factorization.

66420718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 66420718 is about 8149.8906741134. The cubic root of 66420718 is about 404.9808820930.

It can be divided in two parts, 664207 and 18, that added together give a square (664225 = 815²).

The spelling of 66420718 in words is "sixty-six million, four hundred twenty thousand, seven hundred eighteen".