71855501212 has 12 divisors (see below), whose sum is σ = 137178684216. Its totient is φ = 32661591440.

The previous prime is 71855501191. The next prime is 71855501231. The reversal of 71855501212 is 21210555817.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816539743 + ... + 816539830.

It is an arithmetic number, because the mean of its divisors is an integer number (11431557018).

Almost surely, 2^71855501212 is an apocalyptic number.

It is an amenable number.

71855501212 is a deficient number, since it is larger than the sum of its proper divisors (65323183004).

71855501212 is a wasteful number, since it uses less digits than its factorization.

71855501212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633079588 (or 1633079586 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 37.

The spelling of 71855501212 in words is "seventy-one billion, eight hundred fifty-five million, five hundred one thousand, two hundred twelve".