78206086764421 has 24 divisors (see below), whose sum is σ = 99249876909216. Its totient is φ = 60936708863520.

The previous prime is 78206086764409. The next prime is 78206086764427. The reversal of 78206086764421 is 12446768060287.

It is not a de Polignac number, because 78206086764421 - 2¹¹ = 78206086762373 is a prime.

It is a super-2 number, since 2×78206086764421² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78206086764421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78206086764427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6948030 + ... + 14306896.

It is an arithmetic number, because the mean of its divisors is an integer number (4135411537884).

Almost surely, 2^{78206086764421} is an apocalyptic number.

It is an amenable number.

78206086764421 is a deficient number, since it is larger than the sum of its proper divisors (21043790144795).

78206086764421 is a wasteful number, since it uses less digits than its factorization.

78206086764421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7378609 (or 7378602 counting only the distinct ones).

The product of its (nonzero) digits is 43352064, while the sum is 61.

The spelling of 78206086764421 in words is "seventy-eight trillion, two hundred six billion, eighty-six million, seven hundred sixty-four thousand, four hundred twenty-one".