81768803 has 2 divisors, whose sum is σ = 81768804. Its totient is φ = 81768802.

The previous prime is 81768781. The next prime is 81768829. The reversal of 81768803 is 30886718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81768803 - 2¹⁰ = 81767779 is a prime.

It is a super-2 number, since 2×81768803² = 13372274288105618, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (81768403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40884401 + 40884402.

It is an arithmetic number, because the mean of its divisors is an integer number (40884402).

Almost surely, 2^81768803 is an apocalyptic number.

81768803 is a deficient number, since it is larger than the sum of its proper divisors (1).

81768803 is an equidigital number, since it uses as much as digits as its factorization.

81768803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 81768803 is about 9042.6104085048. The cubic root of 81768803 is about 434.0394589195.

The spelling of 81768803 in words is "eighty-one million, seven hundred sixty-eight thousand, eight hundred three".