66417724 has 6 divisors (see below), whose sum is σ = 116231024. Its totient is φ = 33208860.

The previous prime is 66417713. The next prime is 66417727. The reversal of 66417724 is 42771466.

It is a super-2 number, since 2×66417724² = 8822628122680352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66417727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8302212 + ... + 8302219.

Almost surely, 2^66417724 is an apocalyptic number.

It is an amenable number.

66417724 is a deficient number, since it is larger than the sum of its proper divisors (49813300).

66417724 is a wasteful number, since it uses less digits than its factorization.

66417724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16604435 (or 16604433 counting only the distinct ones).

The product of its digits is 56448, while the sum is 37.

The square root of 66417724 is about 8149.7069885978. The cubic root of 66417724 is about 404.9747969888.

It can be divided in two parts, 6641 and 7724, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 66417724 in words is "sixty-six million, four hundred seventeen thousand, seven hundred twenty-four".