78761196506281 has 4 divisors (see below), whose sum is σ = 83394208065492. Its totient is φ = 74128184947072.

The previous prime is 78761196506273. The next prime is 78761196506297. The reversal of 78761196506281 is 18260569116787.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45093118649881 + 33668077856400 = 6715141^2 + 5802420^2 .

It is a cyclic number.

It is not a de Polignac number, because 78761196506281 - 2³ = 78761196506273 is a prime.

It is a super-2 number, since 2×78761196506281² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78761196504281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2316505779580 + ... + 2316505779613.

It is an arithmetic number, because the mean of its divisors is an integer number (20848552016373).

Almost surely, 2^{78761196506281} is an apocalyptic number.

It is an amenable number.

78761196506281 is a deficient number, since it is larger than the sum of its proper divisors (4633011559211).

78761196506281 is a wasteful number, since it uses less digits than its factorization.

78761196506281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4633011559210.

The product of its (nonzero) digits is 60963840, while the sum is 67.

The spelling of 78761196506281 in words is "seventy-eight trillion, seven hundred sixty-one billion, one hundred ninety-six million, five hundred six thousand, two hundred eighty-one".