66566451 has 24 divisors (see below), whose sum is σ = 105657024. Its totient is φ = 37149840.

The previous prime is 66566449. The next prime is 66566453. The reversal of 66566451 is 15466566.

It is an interprime number because it is at equal distance from previous prime (66566449) and next prime (66566453).

It is not a de Polignac number, because 66566451 - 2¹ = 66566449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66566453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1056 + ... + 11586.

It is an arithmetic number, because the mean of its divisors is an integer number (4402376).

Almost surely, 2^66566451 is an apocalyptic number.

66566451 is a deficient number, since it is larger than the sum of its proper divisors (39090573).

66566451 is a wasteful number, since it uses less digits than its factorization.

66566451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10591 (or 10584 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 66566451 is about 8158.8265700406. The cubic root of 66566451 is about 405.2768538361.

The spelling of 66566451 in words is "sixty-six million, five hundred sixty-six thousand, four hundred fifty-one".