166290603538 has 4 divisors (see below), whose sum is σ = 249435905310. Its totient is φ = 83145301768.

The previous prime is 166290603499. The next prime is 166290603559. The reversal of 166290603538 is 835306092661.

It is a happy number.

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., 157960938249 + 8329665289 = 397443^2 + 91267^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 166290603491 and 166290603500.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41572650883 + ... + 41572650886.

Almost surely, 2^166290603538 is an apocalyptic number.

166290603538 is a deficient number, since it is larger than the sum of its proper divisors (83145301772).

166290603538 is an equidigital number, since it uses as much as digits as its factorization.

166290603538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83145301771.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 166290603538 in words is "one hundred sixty-six billion, two hundred ninety million, six hundred three thousand, five hundred thirty-eight".