81415702133 has 4 divisors (see below), whose sum is σ = 86204861100. Its totient is φ = 76626543168.

The previous prime is 81415702127. The next prime is 81415702139. The reversal of 81415702133 is 33120751418.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (81415702127) and next prime (81415702139).

It can be written as a sum of positive squares in 2 ways, for example, as 42544425169 + 38871276964 = 206263^2 + 197158^2 .

It is a cyclic number.

It is not a de Polignac number, because 81415702133 - 2⁴ = 81415702117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81415702093 and 81415702102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81415702139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2394579458 + ... + 2394579491.

It is an arithmetic number, because the mean of its divisors is an integer number (21551215275).

Almost surely, 2^81415702133 is an apocalyptic number.

It is an amenable number.

81415702133 is a deficient number, since it is larger than the sum of its proper divisors (4789158967).

81415702133 is a wasteful number, since it uses less digits than its factorization.

81415702133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4789158966.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 81415702133 in words is "eighty-one billion, four hundred fifteen million, seven hundred two thousand, one hundred thirty-three".