166227635377418 has 4 divisors (see below), whose sum is σ = 249341453066130. Its totient is φ = 83113817688708.

The previous prime is 166227635377409. The next prime is 166227635377423. The reversal of 166227635377418 is 814773536722661.

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., 137864160784249 + 28363474593169 = 11741557^2 + 5325737^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41556908844353 + ... + 41556908844356.

Almost surely, 2^{166227635377418} is an apocalyptic number.

166227635377418 is a deficient number, since it is larger than the sum of its proper divisors (83113817688712).

166227635377418 is an equidigital number, since it uses as much as digits as its factorization.

166227635377418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83113817688711.

The product of its digits is 426746880, while the sum is 68.

The spelling of 166227635377418 in words is "one hundred sixty-six trillion, two hundred twenty-seven billion, six hundred thirty-five million, three hundred seventy-seven thousand, four hundred eighteen".