81768763395 has 96 divisors (see below), whose sum is σ = 159817641984. Its totient is φ = 38315462400.

The previous prime is 81768763379. The next prime is 81768763429. The reversal of 81768763395 is 59336786718.

81768763395 is a `hidden beast` number, since 8 + 176 + 8 + 76 + 3 + 395 = 666.

It is not a de Polignac number, because 81768763395 - 2⁴ = 81768763379 is a prime.

It is a super-2 number, since 2×81768763395² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13086162 + ... + 13092408.

It is an arithmetic number, because the mean of its divisors is an integer number (1664767104).

Almost surely, 2^81768763395 is an apocalyptic number.

81768763395 is a deficient number, since it is larger than the sum of its proper divisors (78048878589).

81768763395 is a wasteful number, since it uses less digits than its factorization.

81768763395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7153 (or 7150 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The spelling of 81768763395 in words is "eighty-one billion, seven hundred sixty-eight million, seven hundred sixty-three thousand, three hundred ninety-five".