1551156566171 has 2 divisors, whose sum is σ = 1551156566172. Its totient is φ = 1551156566170.

The previous prime is 1551156566153. The next prime is 1551156566177. The reversal of 1551156566171 is 1716656511551.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1716656511551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1551156566171 - 2⁶ = 1551156566107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1551156566177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775578283085 + 775578283086.

It is an arithmetic number, because the mean of its divisors is an integer number (775578283086).

Almost surely, 2^{1551156566171} is an apocalyptic number.

1551156566171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551156566171 is an equidigital number, since it uses as much as digits as its factorization.

1551156566171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 945000, while the sum is 50.

The spelling of 1551156566171 in words is "one trillion, five hundred fifty-one billion, one hundred fifty-six million, five hundred sixty-six thousand, one hundred seventy-one".