1346666667978 has 8 divisors (see below), whose sum is σ = 2693333335968. Its totient is φ = 448888889324.

The previous prime is 1346666667971. The next prime is 1346666667979. The reversal of 1346666667978 is 8797666666431.

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

1346666667978 is an admirable number.

It is a super-2 number, since 2×1346666667978² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1346666667971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112222222326 + ... + 112222222337.

It is an arithmetic number, because the mean of its divisors is an integer number (336666666996).

Almost surely, 2^{1346666667978} is an apocalyptic number.

1346666667978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1346666667978 is a wasteful number, since it uses less digits than its factorization.

1346666667978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224444444668.

The product of its digits is 1975228416, while the sum is 75.

The spelling of 1346666667978 in words is "one trillion, three hundred forty-six billion, six hundred sixty-six million, six hundred sixty-seven thousand, nine hundred seventy-eight".