171151993779 has 12 divisors (see below), whose sum is σ = 247107021336. Its totient is φ = 105324303552.

The previous prime is 171151993769. The next prime is 171151993783. The reversal of 171151993779 is 977399151171.

It is not a de Polignac number, because 171151993779 - 2²⁷ = 171017776051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171151993769) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168788442 + ... + 168789455.

It is an arithmetic number, because the mean of its divisors is an integer number (20592251778).

Almost surely, 2^171151993779 is an apocalyptic number.

171151993779 is a deficient number, since it is larger than the sum of its proper divisors (75955027557).

171151993779 is a wasteful number, since it uses less digits than its factorization.

171151993779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337577926 (or 337577913 counting only the distinct ones).

The product of its digits is 3750705, while the sum is 60.

The spelling of 171151993779 in words is "one hundred seventy-one billion, one hundred fifty-one million, nine hundred ninety-three thousand, seven hundred seventy-nine".