1388258081775 has 72 divisors (see below), whose sum is σ = 2495450280960. Its totient is φ = 737751328320.

The previous prime is 1388258081753. The next prime is 1388258081801. The reversal of 1388258081775 is 5771808528831.

1388258081775 is a `hidden beast` number, since 1 + 38 + 8 + 2 + 580 + 8 + 17 + 7 + 5 = 666.

It is not a de Polignac number, because 1388258081775 - 2⁶ = 1388258081711 is a prime.

It is a super-2 number, since 2×1388258081775² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 73214746 + ... + 73233704.

It is an arithmetic number, because the mean of its divisors is an integer number (34659031680).

Almost surely, 2^{1388258081775} is an apocalyptic number.

1388258081775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1388258081775 is a deficient number, since it is larger than the sum of its proper divisors (1107192199185).

1388258081775 is a wasteful number, since it uses less digits than its factorization.

1388258081775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20125 (or 20117 counting only the distinct ones).

The product of its (nonzero) digits is 30105600, while the sum is 63.

The spelling of 1388258081775 in words is "one trillion, three hundred eighty-eight billion, two hundred fifty-eight million, eighty-one thousand, seven hundred seventy-five".