171878751046 has 4 divisors (see below), whose sum is σ = 257818126572. Its totient is φ = 85939375522.

The previous prime is 171878751017. The next prime is 171878751049. The reversal of 171878751046 is 640157878171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 640157878171 = 7 ⋅91451125453.

It is a super-2 number, since 2×171878751046² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171878751049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42969687760 + ... + 42969687763.

It is an arithmetic number, because the mean of its divisors is an integer number (64454531643).

Almost surely, 2^171878751046 is an apocalyptic number.

171878751046 is a deficient number, since it is larger than the sum of its proper divisors (85939375526).

171878751046 is an equidigital number, since it uses as much as digits as its factorization.

171878751046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85939375525.

The product of its (nonzero) digits is 2634240, while the sum is 55.

The spelling of 171878751046 in words is "one hundred seventy-one billion, eight hundred seventy-eight million, seven hundred fifty-one thousand, forty-six".