1388778790125 has 16 divisors (see below), whose sum is σ = 2310927907392. Its totient is φ = 740682021200.

The previous prime is 1388778790123. The next prime is 1388778790177. The reversal of 1388778790125 is 5210978778831.

It is not a de Polignac number, because 1388778790125 - 2¹ = 1388778790123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388778790123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1851704679 + ... + 1851705428.

It is an arithmetic number, because the mean of its divisors is an integer number (144432994212).

Almost surely, 2^{1388778790125} is an apocalyptic number.

1388778790125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1388778790125 is a deficient number, since it is larger than the sum of its proper divisors (922149117267).

1388778790125 is an equidigital number, since it uses as much as digits as its factorization.

1388778790125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703410125 (or 3703410115 counting only the distinct ones).

The product of its (nonzero) digits is 47416320, while the sum is 66.

The spelling of 1388778790125 in words is "one trillion, three hundred eighty-eight billion, seven hundred seventy-eight million, seven hundred ninety thousand, one hundred twenty-five".