66901859 has 2 divisors, whose sum is σ = 66901860. Its totient is φ = 66901858.

The previous prime is 66901843. The next prime is 66901867. The reversal of 66901859 is 95810966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66901859 - 2⁴ = 66901843 is a prime.

It is not a weakly prime, because it can be changed into another prime (66901829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33450929 + 33450930.

It is an arithmetic number, because the mean of its divisors is an integer number (33450930).

Almost surely, 2^66901859 is an apocalyptic number.

66901859 is a deficient number, since it is larger than the sum of its proper divisors (1).

66901859 is an equidigital number, since it uses as much as digits as its factorization.

66901859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 66901859 is about 8179.3556592191. The cubic root of 66901859 is about 405.9564024950.

The spelling of 66901859 in words is "sixty-six million, nine hundred one thousand, eight hundred fifty-nine".