66216457 has 8 divisors (see below), whose sum is σ = 67207040. Its totient is φ = 65229840.

The previous prime is 66216443. The next prime is 66216461. The reversal of 66216457 is 75461266.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66216457 - 2¹¹ = 66214409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66216407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53983 + ... + 55195.

It is an arithmetic number, because the mean of its divisors is an integer number (8400880).

Almost surely, 2^66216457 is an apocalyptic number.

It is an amenable number.

66216457 is a deficient number, since it is larger than the sum of its proper divisors (990583).

66216457 is a wasteful number, since it uses less digits than its factorization.

66216457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1983.

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

The square root of 66216457 is about 8137.3495070570. The cubic root of 66216457 is about 404.5653152607.

The spelling of 66216457 in words is "sixty-six million, two hundred sixteen thousand, four hundred fifty-seven".