166705552161251 has 4 divisors (see below), whose sum is σ = 166705776447504. Its totient is φ = 166705327875000.

The previous prime is 166705552161193. The next prime is 166705552161259. The reversal of 166705552161251 is 152161255507661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166705552161251 - 2²⁶ = 166705485052387 is a prime.

It is a super-2 number, since 2×166705552161251² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166705552161193 and 166705552161202.

It is not an unprimeable number, because it can be changed into a prime (166705552161259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111024500 + ... + 112516001.

It is an arithmetic number, because the mean of its divisors is an integer number (41676444111876).

Almost surely, 2^{166705552161251} is an apocalyptic number.

166705552161251 is a deficient number, since it is larger than the sum of its proper divisors (224286253).

166705552161251 is an equidigital number, since it uses as much as digits as its factorization.

166705552161251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224286252.

The product of its (nonzero) digits is 3780000, while the sum is 53.

The spelling of 166705552161251 in words is "one hundred sixty-six trillion, seven hundred five billion, five hundred fifty-two million, one hundred sixty-one thousand, two hundred fifty-one".