166252666253 has 2 divisors, whose sum is σ = 166252666254. Its totient is φ = 166252666252.

The previous prime is 166252666249. The next prime is 166252666277. The reversal of 166252666253 is 352666252661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118999471369 + 47253194884 = 344963^2 + 217378^2 .

It is a cyclic number.

It is not a de Polignac number, because 166252666253 - 2² = 166252666249 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166252666243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83126333126 + 83126333127.

It is an arithmetic number, because the mean of its divisors is an integer number (83126333127).

Almost surely, 2^166252666253 is an apocalyptic number.

It is an amenable number.

166252666253 is a deficient number, since it is larger than the sum of its proper divisors (1).

166252666253 is an equidigital number, since it uses as much as digits as its factorization.

166252666253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 50.

The spelling of 166252666253 in words is "one hundred sixty-six billion, two hundred fifty-two million, six hundred sixty-six thousand, two hundred fifty-three".