81000018000701 has 2 divisors, whose sum is σ = 81000018000702. Its totient is φ = 81000018000700.

The previous prime is 81000018000653. The next prime is 81000018000703. The reversal of 81000018000701 is 10700081000018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80354622677476 + 645395323225 = 8964074^2 + 803365^2 .

It is a cyclic number.

It is not a de Polignac number, because 81000018000701 - 2²⁶ = 80999950891837 is a prime.

It is a super-2 number, since 2×81000018000701² (a number of 29 digits) contains 22 as substring.

Together with 81000018000703, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81000018000703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40500009000350 + 40500009000351.

It is an arithmetic number, because the mean of its divisors is an integer number (40500009000351).

Almost surely, 2^{81000018000701} is an apocalyptic number.

It is an amenable number.

81000018000701 is a deficient number, since it is larger than the sum of its proper divisors (1).

81000018000701 is an equidigital number, since it uses as much as digits as its factorization.

81000018000701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 26.

Adding to 81000018000701 its reverse (10700081000018), we get a palindrome (91700099000719).

The spelling of 81000018000701 in words is "eighty-one trillion, eighteen million, seven hundred one", and thus it is an aban number.