66861077 has 2 divisors, whose sum is σ = 66861078. Its totient is φ = 66861076.

The previous prime is 66861073. The next prime is 66861103. The reversal of 66861077 is 77016866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53567761 + 13293316 = 7319^2 + 3646^2 .

It is a cyclic number.

It is not a de Polignac number, because 66861077 - 2² = 66861073 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66861073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33430538 + 33430539.

It is an arithmetic number, because the mean of its divisors is an integer number (33430539).

Almost surely, 2^66861077 is an apocalyptic number.

It is an amenable number.

66861077 is a deficient number, since it is larger than the sum of its proper divisors (1).

66861077 is an equidigital number, since it uses as much as digits as its factorization.

66861077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 66861077 is about 8176.8622955263. The cubic root of 66861077 is about 405.8738981650.

The spelling of 66861077 in words is "sixty-six million, eight hundred sixty-one thousand, seventy-seven".