66984451 has 2 divisors, whose sum is σ = 66984452. Its totient is φ = 66984450.

The previous prime is 66984439. The next prime is 66984457. The reversal of 66984451 is 15448966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66984451 - 2⁵ = 66984419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66984398 and 66984407.

It is not a weakly prime, because it can be changed into another prime (66984457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33492225 + 33492226.

It is an arithmetic number, because the mean of its divisors is an integer number (33492226).

Almost surely, 2^66984451 is an apocalyptic number.

66984451 is a deficient number, since it is larger than the sum of its proper divisors (1).

66984451 is an equidigital number, since it uses as much as digits as its factorization.

66984451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 43.

The square root of 66984451 is about 8184.4029104144. The cubic root of 66984451 is about 406.1233882050.

The spelling of 66984451 in words is "sixty-six million, nine hundred eighty-four thousand, four hundred fifty-one".