81078752315 has 16 divisors (see below), whose sum is σ = 106244307936. Its totient is φ = 58908115200.

The previous prime is 81078752311. The next prime is 81078752333. The reversal of 81078752315 is 51325787018.

It is a happy number.

It is not a de Polignac number, because 81078752315 - 2² = 81078752311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81078752315.

It is not an unprimeable number, because it can be changed into a prime (81078752311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 671906 + ... + 783335.

It is an arithmetic number, because the mean of its divisors is an integer number (6640269246).

Almost surely, 2^81078752315 is an apocalyptic number.

81078752315 is a deficient number, since it is larger than the sum of its proper divisors (25165555621).

81078752315 is a wasteful number, since it uses less digits than its factorization.

81078752315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456270.

The product of its (nonzero) digits is 470400, while the sum is 47.

The spelling of 81078752315 in words is "eighty-one billion, seventy-eight million, seven hundred fifty-two thousand, three hundred fifteen".