66576407 has 2 divisors, whose sum is σ = 66576408. Its totient is φ = 66576406.

The previous prime is 66576401. The next prime is 66576409. The reversal of 66576407 is 70467566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66576407 - 2¹⁴ = 66560023 is a prime.

Together with 66576409, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66576401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33288203 + 33288204.

It is an arithmetic number, because the mean of its divisors is an integer number (33288204).

Almost surely, 2^66576407 is an apocalyptic number.

66576407 is a deficient number, since it is larger than the sum of its proper divisors (1).

66576407 is an equidigital number, since it uses as much as digits as its factorization.

66576407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 66576407 is about 8159.4366839874. The cubic root of 66576407 is about 405.2970578836.

The spelling of 66576407 in words is "sixty-six million, five hundred seventy-six thousand, four hundred seven".