81491136010 has 32 divisors (see below), whose sum is σ = 153465632640. Its totient is φ = 31096916928.

The previous prime is 81491136007. The next prime is 81491136019. The reversal of 81491136010 is 1063119418.

It is not an unprimeable number, because it can be changed into a prime (81491136019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 380257 + ... + 554596.

It is an arithmetic number, because the mean of its divisors is an integer number (4795801020).

Almost surely, 2^81491136010 is an apocalyptic number.

81491136010 is a deficient number, since it is larger than the sum of its proper divisors (71974496630).

81491136010 is a wasteful number, since it uses less digits than its factorization.

81491136010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935262.

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 81491136010 in words is "eighty-one billion, four hundred ninety-one million, one hundred thirty-six thousand, ten".