166271888554 has 4 divisors (see below), whose sum is σ = 249407832834. Its totient is φ = 83135944276.

The previous prime is 166271888533. The next prime is 166271888567. The reversal of 166271888554 is 455888172661.

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

It can be written as a sum of positive squares in only one way, i.e., 147482881225 + 18789007329 = 384035^2 + 137073^2 .

It is a junction number, because it is equal to n+sod(n) for n = 166271888492 and 166271888501.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41567972137 + ... + 41567972140.

Almost surely, 2^166271888554 is an apocalyptic number.

166271888554 is a deficient number, since it is larger than the sum of its proper divisors (83135944280).

166271888554 is an equidigital number, since it uses as much as digits as its factorization.

166271888554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83135944279.

The product of its digits is 25804800, while the sum is 61.

The spelling of 166271888554 in words is "one hundred sixty-six billion, two hundred seventy-one million, eight hundred eighty-eight thousand, five hundred fifty-four".