81037104623 has 2 divisors, whose sum is σ = 81037104624. Its totient is φ = 81037104622.

The previous prime is 81037104607. The next prime is 81037104677. The reversal of 81037104623 is 32640173018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81037104623 - 2⁴ = 81037104607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81037134623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40518552311 + 40518552312.

It is an arithmetic number, because the mean of its divisors is an integer number (40518552312).

Almost surely, 2^81037104623 is an apocalyptic number.

81037104623 is a deficient number, since it is larger than the sum of its proper divisors (1).

81037104623 is an equidigital number, since it uses as much as digits as its factorization.

81037104623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 81037104623 in words is "eighty-one billion, thirty-seven million, one hundred four thousand, six hundred twenty-three".