7166561165251 has 2 divisors, whose sum is σ = 7166561165252. Its totient is φ = 7166561165250.

The previous prime is 7166561165213. The next prime is 7166561165273. The reversal of 7166561165251 is 1525611656617.

It is a strong prime.

It is an emirp because it is prime and its reverse (1525611656617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7166561165251 - 2²¹ = 7166559068099 is a prime.

It is not a weakly prime, because it can be changed into another prime (7166561165851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3583280582625 + 3583280582626.

It is an arithmetic number, because the mean of its divisors is an integer number (3583280582626).

Almost surely, 2^{7166561165251} is an apocalyptic number.

7166561165251 is a deficient number, since it is larger than the sum of its proper divisors (1).

7166561165251 is an equidigital number, since it uses as much as digits as its factorization.

7166561165251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268000, while the sum is 52.

The spelling of 7166561165251 in words is "seven trillion, one hundred sixty-six billion, five hundred sixty-one million, one hundred sixty-five thousand, two hundred fifty-one".