1878091517412 has 72 divisors (see below), whose sum is σ = 5187803074272. Its totient is φ = 568149033600.

The previous prime is 1878091517377. The next prime is 1878091517417. The reversal of 1878091517412 is 2147151908781.

It is a happy number.

1878091517412 is a `hidden beast` number, since 1 + 8 + 7 + 80 + 9 + 1 + 517 + 41 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (1878091517417) 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 23 ways as a sum of consecutive naturals, for example, 3807289 + ... + 4272192.

It is an arithmetic number, because the mean of its divisors is an integer number (72052820476).

Almost surely, 2^{1878091517412} is an apocalyptic number.

1878091517412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1878091517412 is an abundant number, since it is smaller than the sum of its proper divisors (3309711556860).

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

1878091517412 is a wasteful number, since it uses less digits than its factorization.

1878091517412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8080089 (or 8080084 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 54.

The spelling of 1878091517412 in words is "one trillion, eight hundred seventy-eight billion, ninety-one million, five hundred seventeen thousand, four hundred twelve".