78508662443 has 2 divisors, whose sum is σ = 78508662444. Its totient is φ = 78508662442.

The previous prime is 78508662391. The next prime is 78508662457. The reversal of 78508662443 is 34426680587.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78508662443 - 2¹⁴ = 78508646059 is a prime.

It is a super-2 number, since 2×78508662443² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78508661443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39254331221 + 39254331222.

It is an arithmetic number, because the mean of its divisors is an integer number (39254331222).

Almost surely, 2^78508662443 is an apocalyptic number.

78508662443 is a deficient number, since it is larger than the sum of its proper divisors (1).

78508662443 is an equidigital number, since it uses as much as digits as its factorization.

78508662443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7741440, while the sum is 53.

The spelling of 78508662443 in words is "seventy-eight billion, five hundred eight million, six hundred sixty-two thousand, four hundred forty-three".