166551650641 has 2 divisors, whose sum is σ = 166551650642. Its totient is φ = 166551650640.

The previous prime is 166551650597. The next prime is 166551650663. The reversal of 166551650641 is 146056155661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99979910416 + 66571740225 = 316196^2 + 258015^2 .

It is a cyclic number.

It is not a de Polignac number, because 166551650641 - 2³³ = 157961716049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166551650591 and 166551650600.

It is not a weakly prime, because it can be changed into another prime (166551651641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83275825320 + 83275825321.

It is an arithmetic number, because the mean of its divisors is an integer number (83275825321).

Almost surely, 2^166551650641 is an apocalyptic number.

It is an amenable number.

166551650641 is a deficient number, since it is larger than the sum of its proper divisors (1).

166551650641 is an equidigital number, since it uses as much as digits as its factorization.

166551650641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 166551650641 in words is "one hundred sixty-six billion, five hundred fifty-one million, six hundred fifty thousand, six hundred forty-one".