81707315933623 has 2 divisors, whose sum is σ = 81707315933624. Its totient is φ = 81707315933622.

The previous prime is 81707315933587. The next prime is 81707315933627. The reversal of 81707315933623 is 32633951370718.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81707315933623 is a prime.

It is a super-2 number, since 2×81707315933623² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81707315933627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40853657966811 + 40853657966812.

It is an arithmetic number, because the mean of its divisors is an integer number (40853657966812).

Almost surely, 2^{81707315933623} is an apocalyptic number.

81707315933623 is a deficient number, since it is larger than the sum of its proper divisors (1).

81707315933623 is an equidigital number, since it uses as much as digits as its factorization.

81707315933623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17146080, while the sum is 58.

The spelling of 81707315933623 in words is "eighty-one trillion, seven hundred seven billion, three hundred fifteen million, nine hundred thirty-three thousand, six hundred twenty-three".