66397451 has 2 divisors, whose sum is σ = 66397452. Its totient is φ = 66397450.

The previous prime is 66397411. The next prime is 66397453. The reversal of 66397451 is 15479366.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66397451 is a prime.

It is a Sophie Germain prime.

Together with 66397453, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66397399 and 66397408.

It is not a weakly prime, because it can be changed into another prime (66397453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33198725 + 33198726.

It is an arithmetic number, because the mean of its divisors is an integer number (33198726).

Almost surely, 2^66397451 is an apocalyptic number.

66397451 is a deficient number, since it is larger than the sum of its proper divisors (1).

66397451 is an equidigital number, since it uses as much as digits as its factorization.

66397451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 41.

The square root of 66397451 is about 8148.4631066232. The cubic root of 66397451 is about 404.9335886635.

The spelling of 66397451 in words is "sixty-six million, three hundred ninety-seven thousand, four hundred fifty-one".