1278431185020 has 48 divisors (see below), whose sum is σ = 3905026167168. Its totient is φ = 309922711360.

The previous prime is 1278431185001. The next prime is 1278431185033. The reversal of 1278431185020 is 205811348721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 968507814 + ... + 968509133.

It is an arithmetic number, because the mean of its divisors is an integer number (81354711816).

Almost surely, 2^{1278431185020} is an apocalyptic number.

1278431185020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278431185020 is an abundant number, since it is smaller than the sum of its proper divisors (2626594982148).

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

1278431185020 is a wasteful number, since it uses less digits than its factorization.

1278431185020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937016970 (or 1937016968 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 42.

The spelling of 1278431185020 in words is "one trillion, two hundred seventy-eight billion, four hundred thirty-one million, one hundred eighty-five thousand, twenty".