166294222553 has 4 divisors (see below), whose sum is σ = 166680056448. Its totient is φ = 165908388660.

The previous prime is 166294222511. The next prime is 166294222583. The reversal of 166294222553 is 355222492661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166294222553 - 2¹² = 166294218457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166294222498 and 166294222507.

It is not an unprimeable number, because it can be changed into a prime (166294222583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192916301 + ... + 192917162.

It is an arithmetic number, because the mean of its divisors is an integer number (41670014112).

Almost surely, 2^166294222553 is an apocalyptic number.

It is an amenable number.

166294222553 is a deficient number, since it is larger than the sum of its proper divisors (385833895).

166294222553 is an equidigital number, since it uses as much as digits as its factorization.

166294222553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385833894.

The product of its digits is 1555200, while the sum is 47.

The spelling of 166294222553 in words is "one hundred sixty-six billion, two hundred ninety-four million, two hundred twenty-two thousand, five hundred fifty-three".