66641712 has 20 divisors (see below), whose sum is σ = 172157880. Its totient is φ = 22213888.

The previous prime is 66641711. The next prime is 66641713. The reversal of 66641712 is 21714666.

It is an interprime number because it is at equal distance from previous prime (66641711) and next prime (66641713).

It is a super-2 number, since 2×66641712² = 8882235556581888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66641711) 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, 694137 + ... + 694232.

It is an arithmetic number, because the mean of its divisors is an integer number (8607894).

Almost surely, 2^66641712 is an apocalyptic number.

It is an amenable number.

66641712 is an abundant number, since it is smaller than the sum of its proper divisors (105516168).

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

66641712 is a wasteful number, since it uses less digits than its factorization.

66641712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388380 (or 1388374 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 66641712 is about 8163.4375112449. The cubic root of 66641712 is about 405.4295336164.

The spelling of 66641712 in words is "sixty-six million, six hundred forty-one thousand, seven hundred twelve".