81301194807632 has 10 divisors (see below), whose sum is σ = 157521064939818. Its totient is φ = 40650597403808.

The previous prime is 81301194807617. The next prime is 81301194807641. The reversal of 81301194807632 is 23670849110318.

It can be written as a sum of positive squares in only one way, i.e., 43314878611216 + 37986316196416 = 6581404^2 + 6163304^2 .

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, 2540662337723 + ... + 2540662337754.

Almost surely, 2^{81301194807632} is an apocalyptic number.

It is an amenable number.

81301194807632 is a deficient number, since it is larger than the sum of its proper divisors (76219870132186).

81301194807632 is a wasteful number, since it uses less digits than its factorization.

81301194807632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5081324675485 (or 5081324675479 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 53.

The spelling of 81301194807632 in words is "eighty-one trillion, three hundred one billion, one hundred ninety-four million, eight hundred seven thousand, six hundred thirty-two".