67878412557 has 8 divisors (see below), whose sum is σ = 90508389600. Its totient is φ = 45250355280.

The previous prime is 67878412523. The next prime is 67878412573. The reversal of 67878412557 is 75521487876.

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

It is not a de Polignac number, because 67878412557 - 2²² = 67874218253 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 67878412557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67878412597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395307 + ... + 540392.

It is an arithmetic number, because the mean of its divisors is an integer number (11313548700).

Almost surely, 2^67878412557 is an apocalyptic number.

It is an amenable number.

67878412557 is a deficient number, since it is larger than the sum of its proper divisors (22629977043).

67878412557 is a wasteful number, since it uses less digits than its factorization.

67878412557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959883.

The product of its digits is 26342400, while the sum is 60.

The spelling of 67878412557 in words is "sixty-seven billion, eight hundred seventy-eight million, four hundred twelve thousand, five hundred fifty-seven".