68438893478 has 4 divisors (see below), whose sum is σ = 102658340220. Its totient is φ = 34219446738.

The previous prime is 68438893469. The next prime is 68438893487. The reversal of 68438893478 is 87439883486.

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

It is an interprime number because it is at equal distance from previous prime (68438893469) and next prime (68438893487).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17109723368 + ... + 17109723371.

It is an arithmetic number, because the mean of its divisors is an integer number (25664585055).

Almost surely, 2^68438893478 is an apocalyptic number.

68438893478 is a deficient number, since it is larger than the sum of its proper divisors (34219446742).

68438893478 is a wasteful number, since it uses less digits than its factorization.

68438893478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34219446741.

The product of its digits is 222953472, while the sum is 68.

The spelling of 68438893478 in words is "sixty-eight billion, four hundred thirty-eight million, eight hundred ninety-three thousand, four hundred seventy-eight".