166425152197 has 2 divisors, whose sum is σ = 166425152198. Its totient is φ = 166425152196.

The previous prime is 166425152191. The next prime is 166425152239. The reversal of 166425152197 is 791251524661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146883628516 + 19541523681 = 383254^2 + 139791^2 .

It is a cyclic number.

It is not a de Polignac number, because 166425152197 - 2³ = 166425152189 is a prime.

It is a super-2 number, since 2×166425152197² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166425152197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166425152191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83212576098 + 83212576099.

It is an arithmetic number, because the mean of its divisors is an integer number (83212576099).

Almost surely, 2^166425152197 is an apocalyptic number.

It is an amenable number.

166425152197 is a deficient number, since it is larger than the sum of its proper divisors (1).

166425152197 is an equidigital number, since it uses as much as digits as its factorization.

166425152197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 49.

The spelling of 166425152197 in words is "one hundred sixty-six billion, four hundred twenty-five million, one hundred fifty-two thousand, one hundred ninety-seven".