67394978919 has 12 divisors (see below), whose sum is σ = 98312148792. Its totient is φ = 44485134000.

The previous prime is 67394978899. The next prime is 67394978923. The reversal of 67394978919 is 91987949376.

67394978919 is a `hidden beast` number, since 67 + 394 + 97 + 8 + 91 + 9 = 666.

It is not a de Polignac number, because 67394978919 - 2¹⁷ = 67394847847 is a prime.

It is a super-2 number, since 2×67394978919² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67394978969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37070037 + ... + 37071854.

It is an arithmetic number, because the mean of its divisors is an integer number (8192679066).

Almost surely, 2^67394978919 is an apocalyptic number.

67394978919 is a deficient number, since it is larger than the sum of its proper divisors (30917169873).

67394978919 is a wasteful number, since it uses less digits than its factorization.

67394978919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74141998 (or 74141995 counting only the distinct ones).

The product of its digits is 185177664, while the sum is 72.

The spelling of 67394978919 in words is "sixty-seven billion, three hundred ninety-four million, nine hundred seventy-eight thousand, nine hundred nineteen".