665377848101 has 2 divisors, whose sum is σ = 665377848102. Its totient is φ = 665377848100.

The previous prime is 665377847989. The next prime is 665377848103. The reversal of 665377848101 is 101848773566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 608626221025 + 56751627076 = 780145^2 + 238226^2 .

It is a cyclic number.

It is not a de Polignac number, because 665377848101 - 2³⁴ = 648197978917 is a prime.

It is a Sophie Germain prime.

Together with 665377848103, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665377848103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332688924050 + 332688924051.

It is an arithmetic number, because the mean of its divisors is an integer number (332688924051).

Almost surely, 2^665377848101 is an apocalyptic number.

It is an amenable number.

665377848101 is a deficient number, since it is larger than the sum of its proper divisors (1).

665377848101 is an equidigital number, since it uses as much as digits as its factorization.

665377848101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6773760, while the sum is 56.

The spelling of 665377848101 in words is "six hundred sixty-five billion, three hundred seventy-seven million, eight hundred forty-eight thousand, one hundred one".