81762763793408 has 22 divisors (see below), whose sum is σ = 163445681139846. Its totient is φ = 40881381896192.

The previous prime is 81762763793369. The next prime is 81762763793441. The reversal of 81762763793408 is 80439736726718.

It can be written as a sum of positive squares in only one way, i.e., 45466862239744 + 36295901553664 = 6742912^2 + 6024608^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39923223485 + ... + 39923225532.

Almost surely, 2^{81762763793408} is an apocalyptic number.

It is an amenable number.

81762763793408 is a deficient number, since it is larger than the sum of its proper divisors (81682917346438).

81762763793408 is an equidigital number, since it uses as much as digits as its factorization.

81762763793408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79846449037 (or 79846449019 counting only the distinct ones).

The product of its (nonzero) digits is 512096256, while the sum is 71.

The spelling of 81762763793408 in words is "eighty-one trillion, seven hundred sixty-two billion, seven hundred sixty-three million, seven hundred ninety-three thousand, four hundred eight".