171942026893 has 24 divisors (see below), whose sum is σ = 220653591480. Its totient is φ = 132723924480.

The previous prime is 171942026891. The next prime is 171942026959. The reversal of 171942026893 is 398620249171.

It can be written as a sum of positive squares in 4 ways, for example, as 9761044804 + 162180982089 = 98798^2 + 402717^2 .

It is not a de Polignac number, because 171942026893 - 2¹ = 171942026891 is a prime.

It is a super-2 number, since 2×171942026893² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 171942026893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171942026891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3265648 + ... + 3317881.

It is an arithmetic number, because the mean of its divisors is an integer number (9193899645).

Almost surely, 2^171942026893 is an apocalyptic number.

171942026893 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

171942026893 is a deficient number, since it is larger than the sum of its proper divisors (48711564587).

171942026893 is a wasteful number, since it uses less digits than its factorization.

171942026893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6583597 (or 6583590 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 171942026893 in words is "one hundred seventy-one billion, nine hundred forty-two million, twenty-six thousand, eight hundred ninety-three".