81366076131 has 8 divisors (see below), whose sum is σ = 108489419520. Its totient is φ = 54243391752.

The previous prime is 81366076117. The next prime is 81366076133. The reversal of 81366076131 is 13167066318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81366076131 - 2⁶ = 81366076067 is a prime.

It is a super-2 number, since 2×81366076131² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81366076133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395890 + ... + 565208.

It is an arithmetic number, because the mean of its divisors is an integer number (13561177440).

Almost surely, 2^81366076131 is an apocalyptic number.

81366076131 is a deficient number, since it is larger than the sum of its proper divisors (27123343389).

81366076131 is a wasteful number, since it uses less digits than its factorization.

81366076131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329505.

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 81366076131 in words is "eighty-one billion, three hundred sixty-six million, seventy-six thousand, one hundred thirty-one".