81748760378 has 4 divisors (see below), whose sum is σ = 122623140570. Its totient is φ = 40874380188.

The previous prime is 81748760297. The next prime is 81748760383. The reversal of 81748760378 is 87306784718.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 80790672169 + 958088209 = 284237^2 + 30953^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20437190093 + ... + 20437190096.

Almost surely, 2^81748760378 is an apocalyptic number.

81748760378 is a deficient number, since it is larger than the sum of its proper divisors (40874380192).

81748760378 is a wasteful number, since it uses less digits than its factorization.

81748760378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40874380191.

The product of its (nonzero) digits is 12644352, while the sum is 59.

The spelling of 81748760378 in words is "eighty-one billion, seven hundred forty-eight million, seven hundred sixty thousand, three hundred seventy-eight".