66642412 has 12 divisors (see below), whose sum is σ = 118825056. Its totient is φ = 32692400.

The previous prime is 66642409. The next prime is 66642419. The reversal of 66642412 is 21424666.

It is a super-2 number, since 2×66642412² = 8882422154355488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66642419) 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, 156964 + ... + 157387.

It is an arithmetic number, because the mean of its divisors is an integer number (9902088).

Almost surely, 2^66642412 is an apocalyptic number.

It is an amenable number.

66642412 is a deficient number, since it is larger than the sum of its proper divisors (52182644).

66642412 is a wasteful number, since it uses less digits than its factorization.

66642412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314408 (or 314406 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 66642412 is about 8163.4803852279. The cubic root of 66642412 is about 405.4309531462.

The spelling of 66642412 in words is "sixty-six million, six hundred forty-two thousand, four hundred twelve".