81201415663 has 2 divisors, whose sum is σ = 81201415664. Its totient is φ = 81201415662.

The previous prime is 81201415651. The next prime is 81201415697. The reversal of 81201415663 is 36651410218.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81201415663 - 2⁹ = 81201415151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81201415643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40600707831 + 40600707832.

It is an arithmetic number, because the mean of its divisors is an integer number (40600707832).

Almost surely, 2^81201415663 is an apocalyptic number.

81201415663 is a deficient number, since it is larger than the sum of its proper divisors (1).

81201415663 is an equidigital number, since it uses as much as digits as its factorization.

81201415663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 81201415663 in words is "eighty-one billion, two hundred one million, four hundred fifteen thousand, six hundred sixty-three".