171006991628638 has 32 divisors (see below), whose sum is σ = 282063605372640. Its totient is φ = 77112000000000.

The previous prime is 171006991628617. The next prime is 171006991628651. The reversal of 171006991628638 is 836826199600171.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50871363 + ... + 54128638.

It is an arithmetic number, because the mean of its divisors is an integer number (8814487667895).

Almost surely, 2^{171006991628638} is an apocalyptic number.

171006991628638 is a deficient number, since it is larger than the sum of its proper divisors (111056613744002).

171006991628638 is a wasteful number, since it uses less digits than its factorization.

171006991628638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105000604.

The product of its (nonzero) digits is 47029248, while the sum is 67.

The spelling of 171006991628638 in words is "one hundred seventy-one trillion, six billion, nine hundred ninety-one million, six hundred twenty-eight thousand, six hundred thirty-eight".