166135981428554 has 8 divisors (see below), whose sum is σ = 250580789669028. Its totient is φ = 82609051538880.

The previous prime is 166135981428479. The next prime is 166135981428559. The reversal of 166135981428554 is 455824189531661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 145926955680529 + 20209025748025 = 12080023^2 + 4495445^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (166135981428559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229469587247 + ... + 229469587970.

Almost surely, 2^{166135981428554} is an apocalyptic number.

166135981428554 is a deficient number, since it is larger than the sum of its proper divisors (84444808240474).

166135981428554 is a wasteful number, since it uses less digits than its factorization.

166135981428554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458939175400.

The product of its digits is 248832000, while the sum is 68.

The spelling of 166135981428554 in words is "one hundred sixty-six trillion, one hundred thirty-five billion, nine hundred eighty-one million, four hundred twenty-eight thousand, five hundred fifty-four".