81202261012 has 6 divisors (see below), whose sum is σ = 142103956778. Its totient is φ = 40601130504.

The previous prime is 81202261003. The next prime is 81202261051. The reversal of 81202261012 is 21016220218.

It can be written as a sum of positive squares in only one way, i.e., 81091674756 + 110586256 = 284766^2 + 10516^2 .

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, 10150282623 + ... + 10150282630.

Almost surely, 2^81202261012 is an apocalyptic number.

It is an amenable number.

81202261012 is a deficient number, since it is larger than the sum of its proper divisors (60901695766).

81202261012 is a wasteful number, since it uses less digits than its factorization.

81202261012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20300565257 (or 20300565255 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The spelling of 81202261012 in words is "eighty-one billion, two hundred two million, two hundred sixty-one thousand, twelve".