81491483503 has 2 divisors, whose sum is σ = 81491483504. Its totient is φ = 81491483502.

The previous prime is 81491483477. The next prime is 81491483537. The reversal of 81491483503 is 30538419418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81491483503 - 2²⁹ = 80954612591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81491487503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40745741751 + 40745741752.

It is an arithmetic number, because the mean of its divisors is an integer number (40745741752).

Almost surely, 2^81491483503 is an apocalyptic number.

81491483503 is a deficient number, since it is larger than the sum of its proper divisors (1).

81491483503 is an equidigital number, since it uses as much as digits as its factorization.

81491483503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 81491483503 in words is "eighty-one billion, four hundred ninety-one million, four hundred eighty-three thousand, five hundred three".