77850813212 has 12 divisors (see below), whose sum is σ = 138272340360. Its totient is φ = 38344430256.

The previous prime is 77850813211. The next prime is 77850813239. The reversal of 77850813212 is 21231805877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77850813211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145243787 + ... + 145244322.

It is an arithmetic number, because the mean of its divisors is an integer number (11522695030).

Almost surely, 2^77850813212 is an apocalyptic number.

It is an amenable number.

77850813212 is a deficient number, since it is larger than the sum of its proper divisors (60421527148).

77850813212 is a wasteful number, since it uses less digits than its factorization.

77850813212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290488180 (or 290488178 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 44.

The spelling of 77850813212 in words is "seventy-seven billion, eight hundred fifty million, eight hundred thirteen thousand, two hundred twelve".