81079201012 has 6 divisors (see below), whose sum is σ = 141888601778. Its totient is φ = 40539600504.

The previous prime is 81079200919. The next prime is 81079201013. The reversal of 81079201012 is 21010297018.

It can be written as a sum of positive squares in only one way, i.e., 66149782416 + 14929418596 = 257196^2 + 122186^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81079201013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10134900123 + ... + 10134900130.

Almost surely, 2^81079201012 is an apocalyptic number.

It is an amenable number.

81079201012 is a deficient number, since it is larger than the sum of its proper divisors (60809400766).

81079201012 is a wasteful number, since it uses less digits than its factorization.

81079201012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20269800257 (or 20269800255 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 81079201012 in words is "eighty-one billion, seventy-nine million, two hundred one thousand, twelve".