666261662030077 has 2 divisors, whose sum is σ = 666261662030078. Its totient is φ = 666261662030076.

The previous prime is 666261662030053. The next prime is 666261662030101. The reversal of 666261662030077 is 770030266162666.

It is a balanced prime because it is at equal distance from previous prime (666261662030053) and next prime (666261662030101).

It can be written as a sum of positive squares in only one way, i.e., 537564117914041 + 128697544116036 = 23185429^2 + 11344494^2 .

It is a cyclic number.

It is not a de Polignac number, because 666261662030077 - 2⁴⁷ = 525524173674749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666261662030047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333130831015038 + 333130831015039.

It is an arithmetic number, because the mean of its divisors is an integer number (333130831015039).

Almost surely, 2^{666261662030077} is an apocalyptic number.

It is an amenable number.

666261662030077 is a deficient number, since it is larger than the sum of its proper divisors (1).

666261662030077 is an equidigital number, since it uses as much as digits as its factorization.

666261662030077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 58.

The spelling of 666261662030077 in words is "six hundred sixty-six trillion, two hundred sixty-one billion, six hundred sixty-two million, thirty thousand, seventy-seven".