1665776627201 has 2 divisors, whose sum is σ = 1665776627202. Its totient is φ = 1665776627200.

The previous prime is 1665776627059. The next prime is 1665776627257. The reversal of 1665776627201 is 1027266775661.

It is a happy number.

It is an a-pointer prime, because the next prime (1665776627257) can be obtained adding 1665776627201 to its sum of digits (56).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1119247623025 + 546529004176 = 1057945^2 + 739276^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665776627201 - 2²² = 1665772432897 is a prime.

It is a super-3 number, since 3×1665776627201³ (a number of 38 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1665776627261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832888313600 + 832888313601.

It is an arithmetic number, because the mean of its divisors is an integer number (832888313601).

Almost surely, 2^{1665776627201} is an apocalyptic number.

It is an amenable number.

1665776627201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665776627201 is an equidigital number, since it uses as much as digits as its factorization.

1665776627201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8890560, while the sum is 56.

The spelling of 1665776627201 in words is "one trillion, six hundred sixty-five billion, seven hundred seventy-six million, six hundred twenty-seven thousand, two hundred one".