171138516964 has 6 divisors (see below), whose sum is σ = 299492404694. Its totient is φ = 85569258480.

The previous prime is 171138516961. The next prime is 171138516971. The reversal of 171138516964 is 469615831171.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 130459660864 + 40678856100 = 361192^2 + 201690^2 .

It is not an unprimeable number, because it can be changed into a prime (171138516961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21392314617 + ... + 21392314624.

Almost surely, 2^171138516964 is an apocalyptic number.

It is an amenable number.

171138516964 is a deficient number, since it is larger than the sum of its proper divisors (128353887730).

171138516964 is a wasteful number, since it uses less digits than its factorization.

171138516964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42784629245 (or 42784629243 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 52.

The spelling of 171138516964 in words is "one hundred seventy-one billion, one hundred thirty-eight million, five hundred sixteen thousand, nine hundred sixty-four".