166051397 has 2 divisors, whose sum is σ = 166051398. Its totient is φ = 166051396.

The previous prime is 166051387. The next prime is 166051399. The reversal of 166051397 is 793150661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166048996 + 2401 = 12886^2 + 49^2 .

It is a cyclic number.

It is not a de Polignac number, because 166051397 - 2¹⁶ = 165985861 is a prime.

Together with 166051399, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166051397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166051399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83025698 + 83025699.

It is an arithmetic number, because the mean of its divisors is an integer number (83025699).

Almost surely, 2^166051397 is an apocalyptic number.

It is an amenable number.

166051397 is a deficient number, since it is larger than the sum of its proper divisors (1).

166051397 is an equidigital number, since it uses as much as digits as its factorization.

166051397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 166051397 is about 12886.0931627860. The cubic root of 166051397 is about 549.6431812320.

The spelling of 166051397 in words is "one hundred sixty-six million, fifty-one thousand, three hundred ninety-seven".