81700162011 has 48 divisors (see below), whose sum is σ = 140415702336. Its totient is φ = 45262153728.

The previous prime is 81700162003. The next prime is 81700162081. The reversal of 81700162011 is 11026100718.

It is not a de Polignac number, because 81700162011 - 2³ = 81700162003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81700162081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 847210 + ... + 938703.

It is an arithmetic number, because the mean of its divisors is an integer number (2925327132).

Almost surely, 2^81700162011 is an apocalyptic number.

81700162011 is a deficient number, since it is larger than the sum of its proper divisors (58715540325).

81700162011 is a wasteful number, since it uses less digits than its factorization.

81700162011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785972 (or 1785969 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 27.

Adding to 81700162011 its reverse (11026100718), we get a palindrome (92726262729).

The spelling of 81700162011 in words is "eighty-one billion, seven hundred million, one hundred sixty-two thousand, eleven".