78903621871 has 2 divisors, whose sum is σ = 78903621872. Its totient is φ = 78903621870.

The previous prime is 78903621869. The next prime is 78903621883. The reversal of 78903621871 is 17812630987.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78903621871 - 2¹ = 78903621869 is a prime.

Together with 78903621869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78903621371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39451810935 + 39451810936.

It is an arithmetic number, because the mean of its divisors is an integer number (39451810936).

Almost surely, 2^78903621871 is an apocalyptic number.

78903621871 is a deficient number, since it is larger than the sum of its proper divisors (1).

78903621871 is an equidigital number, since it uses as much as digits as its factorization.

78903621871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The spelling of 78903621871 in words is "seventy-eight billion, nine hundred three million, six hundred twenty-one thousand, eight hundred seventy-one".