166057547401 has 2 divisors, whose sum is σ = 166057547402. Its totient is φ = 166057547400.

The previous prime is 166057547399. The next prime is 166057547437. The reversal of 166057547401 is 104745750661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141432405625 + 24625141776 = 376075^2 + 156924^2 .

It is an emirp because it is prime and its reverse (104745750661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166057547401 - 2¹ = 166057547399 is a prime.

Together with 166057547399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166057547501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83028773700 + 83028773701.

It is an arithmetic number, because the mean of its divisors is an integer number (83028773701).

Almost surely, 2^166057547401 is an apocalyptic number.

It is an amenable number.

166057547401 is a deficient number, since it is larger than the sum of its proper divisors (1).

166057547401 is an equidigital number, since it uses as much as digits as its factorization.

166057547401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 705600, while the sum is 46.

The spelling of 166057547401 in words is "one hundred sixty-six billion, fifty-seven million, five hundred forty-seven thousand, four hundred one".