66501451 has 2 divisors, whose sum is σ = 66501452. Its totient is φ = 66501450.

The previous prime is 66501403. The next prime is 66501473. The reversal of 66501451 is 15410566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66501451 - 2⁹ = 66500939 is a prime.

It is not a weakly prime, because it can be changed into another prime (66501401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250725 + 33250726.

It is an arithmetic number, because the mean of its divisors is an integer number (33250726).

Almost surely, 2^66501451 is an apocalyptic number.

66501451 is a deficient number, since it is larger than the sum of its proper divisors (1).

66501451 is an equidigital number, since it uses as much as digits as its factorization.

66501451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 66501451 is about 8154.8421811829. The cubic root of 66501451 is about 405.1448976023.

The spelling of 66501451 in words is "sixty-six million, five hundred one thousand, four hundred fifty-one".