78203781076361 has 4 divisors (see below), whose sum is σ = 78204364677012. Its totient is φ = 78203197475712.

The previous prime is 78203781076331. The next prime is 78203781076373. The reversal of 78203781076361 is 16367018730287.

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 53556329331961 + 24647451744400 = 7318219^2 + 4964620^2 .

It is a cyclic number.

It is not a de Polignac number, because 78203781076361 - 2¹⁴ = 78203781059977 is a prime.

It is a super-2 number, since 2×78203781076361² (a number of 29 digits) contains 22 as substring.

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 78203781076361.

It is not an unprimeable number, because it can be changed into a prime (78203781076331) 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, 291599276 + ... + 291867341.

It is an arithmetic number, because the mean of its divisors is an integer number (19551091169253).

Almost surely, 2^{78203781076361} is an apocalyptic number.

It is an amenable number.

78203781076361 is a deficient number, since it is larger than the sum of its proper divisors (583600651).

78203781076361 is a wasteful number, since it uses less digits than its factorization.

78203781076361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583600650.

The product of its (nonzero) digits is 14224896, while the sum is 59.

The spelling of 78203781076361 in words is "seventy-eight trillion, two hundred three billion, seven hundred eighty-one million, seventy-six thousand, three hundred sixty-one".