166790172253 has 2 divisors, whose sum is σ = 166790172254. Its totient is φ = 166790172252.

The previous prime is 166790172187. The next prime is 166790172277. The reversal of 166790172253 is 352271097661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148654971364 + 18135200889 = 385558^2 + 134667^2 .

It is a cyclic number.

It is not a de Polignac number, because 166790172253 - 2²¹ = 166788075101 is a prime.

It is a super-2 number, since 2×166790172253² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166790172197 and 166790172206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166790172953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83395086126 + 83395086127.

It is an arithmetic number, because the mean of its divisors is an integer number (83395086127).

Almost surely, 2^166790172253 is an apocalyptic number.

It is an amenable number.

166790172253 is a deficient number, since it is larger than the sum of its proper divisors (1).

166790172253 is an equidigital number, since it uses as much as digits as its factorization.

166790172253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 166790172253 in words is "one hundred sixty-six billion, seven hundred ninety million, one hundred seventy-two thousand, two hundred fifty-three".