66868057 has 2 divisors, whose sum is σ = 66868058. Its totient is φ = 66868056.

The previous prime is 66868031. The next prime is 66868091. The reversal of 66868057 is 75086866.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36132121 + 30735936 = 6011^2 + 5544^2 .

It is a cyclic number.

It is not a de Polignac number, because 66868057 - 2⁷ = 66867929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66867998 and 66868016.

It is not a weakly prime, because it can be changed into another prime (66868757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33434028 + 33434029.

It is an arithmetic number, because the mean of its divisors is an integer number (33434029).

Almost surely, 2^66868057 is an apocalyptic number.

It is an amenable number.

66868057 is a deficient number, since it is larger than the sum of its proper divisors (1).

66868057 is an equidigital number, since it uses as much as digits as its factorization.

66868057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 66868057 is about 8177.2890984727. The cubic root of 66868057 is about 405.8880214853. Note that the first 3 decimals are identical.

The spelling of 66868057 in words is "sixty-six million, eight hundred sixty-eight thousand, fifty-seven".