127978668012 has 24 divisors (see below), whose sum is σ = 321587422576. Its totient is φ = 39378051648.

The previous prime is 127978667989. The next prime is 127978668017. The reversal of 127978668012 is 210866879721.

It is a super-2 number, since 2×127978668012² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (127978668017) 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, 410187883 + ... + 410188194.

Almost surely, 2^127978668012 is an apocalyptic number.

127978668012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

127978668012 is an abundant number, since it is smaller than the sum of its proper divisors (193608754564).

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

127978668012 is a wasteful number, since it uses less digits than its factorization.

127978668012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820376097 (or 820376095 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 57.

The spelling of 127978668012 in words is "one hundred twenty-seven billion, nine hundred seventy-eight million, six hundred sixty-eight thousand, twelve".