81413664037 has 16 divisors (see below), whose sum is σ = 89116042752. Its totient is φ = 74042357760.

The previous prime is 81413664023. The next prime is 81413664061. The reversal of 81413664037 is 73046631418.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81413664037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81413663984 and 81413664002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81413664097) 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 15 ways as a sum of consecutive naturals, for example, 239898 + ... + 469444.

It is an arithmetic number, because the mean of its divisors is an integer number (5569752672).

Almost surely, 2^81413664037 is an apocalyptic number.

It is an amenable number.

81413664037 is a deficient number, since it is larger than the sum of its proper divisors (7702378715).

81413664037 is a wasteful number, since it uses less digits than its factorization.

81413664037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230268.

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 81413664037 in words is "eighty-one billion, four hundred thirteen million, six hundred sixty-four thousand, thirty-seven".