78850115082421 has 2 divisors, whose sum is σ = 78850115082422. Its totient is φ = 78850115082420.

The previous prime is 78850115082397. The next prime is 78850115082439. The reversal of 78850115082421 is 12428051105887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76340935528900 + 2509179553521 = 8737330^2 + 1584039^2 .

It is a cyclic number.

It is not a de Polignac number, because 78850115082421 - 2¹⁵ = 78850115049653 is a prime.

It is a super-2 number, since 2×78850115082421² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78850115082461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39425057541210 + 39425057541211.

It is an arithmetic number, because the mean of its divisors is an integer number (39425057541211).

Almost surely, 2^{78850115082421} is an apocalyptic number.

It is an amenable number.

78850115082421 is a deficient number, since it is larger than the sum of its proper divisors (1).

78850115082421 is an equidigital number, since it uses as much as digits as its factorization.

78850115082421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1433600, while the sum is 52.

The spelling of 78850115082421 in words is "seventy-eight trillion, eight hundred fifty billion, one hundred fifteen million, eighty-two thousand, four hundred twenty-one".