71658667880 has 16 divisors (see below), whose sum is σ = 161232002820. Its totient is φ = 28663467136.

The previous prime is 71658667879. The next prime is 71658667897. The reversal of 71658667880 is 8876685617.

It can be written as a sum of positive squares in 2 ways, for example, as 71493133924 + 165533956 = 267382^2 + 12866^2 .

It is a super-2 number, since 2×71658667880² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 895733309 + ... + 895733388.

Almost surely, 2^71658667880 is an apocalyptic number.

It is an amenable number.

71658667880 is an abundant number, since it is smaller than the sum of its proper divisors (89573334940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71658667880 is a wasteful number, since it uses less digits than its factorization.

71658667880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1791466708 (or 1791466704 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 62.

The spelling of 71658667880 in words is "seventy-one billion, six hundred fifty-eight million, six hundred sixty-seven thousand, eight hundred eighty".