67478779973978 has 8 divisors (see below), whose sum is σ = 101222047090272. Its totient is φ = 33738097610556.

The previous prime is 67478779973951. The next prime is 67478779973993. The reversal of 67478779973978 is 87937997787476.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 646122950 + ... + 646227377.

It is an arithmetic number, because the mean of its divisors is an integer number (12652755886284).

Almost surely, 2^{67478779973978} is an apocalyptic number.

67478779973978 is a deficient number, since it is larger than the sum of its proper divisors (33743267116294).

67478779973978 is a wasteful number, since it uses less digits than its factorization.

67478779973978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292376436.

The product of its digits is 395210285568, while the sum is 98.

The spelling of 67478779973978 in words is "sixty-seven trillion, four hundred seventy-eight billion, seven hundred seventy-nine million, nine hundred seventy-three thousand, nine hundred seventy-eight".