78621412687 has 2 divisors, whose sum is σ = 78621412688. Its totient is φ = 78621412686.

The previous prime is 78621412633. The next prime is 78621412699.

78621412687 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 78621412687 - 2¹⁵ = 78621379919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78621412087) 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 as a sum of consecutive naturals, namely, 39310706343 + 39310706344.

It is an arithmetic number, because the mean of its divisors is an integer number (39310706344).

Almost surely, 2^78621412687 is an apocalyptic number.

78621412687 is a deficient number, since it is larger than the sum of its proper divisors (1).

78621412687 is an equidigital number, since it uses as much as digits as its factorization.

78621412687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1806336, while the sum is 52.

The spelling of 78621412687 in words is "seventy-eight billion, six hundred twenty-one million, four hundred twelve thousand, six hundred eighty-seven".