81864010010 has 16 divisors (see below), whose sum is σ = 148206985416. Its totient is φ = 32556322368.

The previous prime is 81864010003. The next prime is 81864010021. The reversal of 81864010010 is 1001046818.

It can be written as a sum of positive squares in 4 ways, for example, as 81858359881 + 5650129 = 286109^2 + 2377^2 .

It is a super-2 number, since 2×81864010010² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 23658389 + ... + 23661848.

Almost surely, 2^81864010010 is an apocalyptic number.

81864010010 is a deficient number, since it is larger than the sum of its proper divisors (66342975406).

81864010010 is a wasteful number, since it uses less digits than its factorization.

81864010010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47320417.

The product of its (nonzero) digits is 1536, while the sum is 29.

Adding to 81864010010 its reverse (1001046818), we get a palindrome (82865056828).

The spelling of 81864010010 in words is "eighty-one billion, eight hundred sixty-four million, ten thousand, ten".