66718242 has 20 divisors (see below), whose sum is σ = 149498646. Its totient is φ = 22239360.

The previous prime is 66718237. The next prime is 66718247. The reversal of 66718242 is 24281766.

It is an interprime number because it is at equal distance from previous prime (66718237) and next prime (66718247).

It can be written as a sum of positive squares in only one way, i.e., 65755881 + 962361 = 8109^2 + 981^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66718197 and 66718206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66718247) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 205759 + ... + 206082.

Almost surely, 2^66718242 is an apocalyptic number.

66718242 is an abundant number, since it is smaller than the sum of its proper divisors (82780404).

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

66718242 is a wasteful number, since it uses less digits than its factorization.

66718242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411855 (or 411846 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 66718242 is about 8168.1235299180. The cubic root of 66718242 is about 405.5846699503.

The spelling of 66718242 in words is "sixty-six million, seven hundred eighteen thousand, two hundred forty-two".