78838018450087 has 4 divisors (see below), whose sum is σ = 84902481407800. Its totient is φ = 72773555492376.

The previous prime is 78838018449997. The next prime is 78838018450117. The reversal of 78838018450087 is 78005481083887.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78838018450087 - 2⁷ = 78838018449959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78838018450487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3032231478837 + ... + 3032231478862.

It is an arithmetic number, because the mean of its divisors is an integer number (21225620351950).

Almost surely, 2^{78838018450087} is an apocalyptic number.

78838018450087 is a deficient number, since it is larger than the sum of its proper divisors (6064462957713).

78838018450087 is a wasteful number, since it uses less digits than its factorization.

78838018450087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6064462957712.

The product of its (nonzero) digits is 96337920, while the sum is 67.

The spelling of 78838018450087 in words is "seventy-eight trillion, eight hundred thirty-eight billion, eighteen million, four hundred fifty thousand, eighty-seven".