66412756 has 6 divisors (see below), whose sum is σ = 116222330. Its totient is φ = 33206376.

The previous prime is 66412741. The next prime is 66412783. The reversal of 66412756 is 65721466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 56490256 + 9922500 = 7516^2 + 3150^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8301591 + ... + 8301598.

Almost surely, 2^66412756 is an apocalyptic number.

It is an amenable number.

66412756 is a deficient number, since it is larger than the sum of its proper divisors (49809574).

66412756 is a wasteful number, since it uses less digits than its factorization.

66412756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16603193 (or 16603191 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 66412756 is about 8149.4021866638. The cubic root of 66412756 is about 404.9646994584.

The spelling of 66412756 in words is "sixty-six million, four hundred twelve thousand, seven hundred fifty-six".