81603757363 has 2 divisors, whose sum is σ = 81603757364. Its totient is φ = 81603757362.

The previous prime is 81603757307. The next prime is 81603757399. The reversal of 81603757363 is 36375730618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81603757363 - 2⁹ = 81603756851 is a prime.

It is a super-3 number, since 3×81603757363³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (81603757303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40801878681 + 40801878682.

It is an arithmetic number, because the mean of its divisors is an integer number (40801878682).

Almost surely, 2^81603757363 is an apocalyptic number.

81603757363 is a deficient number, since it is larger than the sum of its proper divisors (1).

81603757363 is an equidigital number, since it uses as much as digits as its factorization.

81603757363 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The spelling of 81603757363 in words is "eighty-one billion, six hundred three million, seven hundred fifty-seven thousand, three hundred sixty-three".