71867509172 has 6 divisors (see below), whose sum is σ = 125768141058. Its totient is φ = 35933754584.

The previous prime is 71867509151. The next prime is 71867509201. The reversal of 71867509172 is 27190576817.

It can be written as a sum of positive squares in only one way, i.e., 71399046436 + 468462736 = 267206^2 + 21644^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8983438643 + ... + 8983438650.

It is an arithmetic number, because the mean of its divisors is an integer number (20961356843).

Almost surely, 2^71867509172 is an apocalyptic number.

It is an amenable number.

71867509172 is a deficient number, since it is larger than the sum of its proper divisors (53900631886).

71867509172 is a wasteful number, since it uses less digits than its factorization.

71867509172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17966877297 (or 17966877295 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 53.

The spelling of 71867509172 in words is "seventy-one billion, eight hundred sixty-seven million, five hundred nine thousand, one hundred seventy-two".