11515381398 has 24 divisors (see below), whose sum is σ = 25040076048. Its totient is φ = 3824601552.

The previous prime is 11515381363. The next prime is 11515381403. The reversal of 11515381398 is 89318351511.

11515381398 is a `hidden beast` number, since 1 + 1 + 515 + 38 + 13 + 98 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1149786 + ... + 1159757.

It is an arithmetic number, because the mean of its divisors is an integer number (1043336502).

Almost surely, 2^11515381398 is an apocalyptic number.

11515381398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11515381398 is an abundant number, since it is smaller than the sum of its proper divisors (13524694650).

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

11515381398 is a wasteful number, since it uses less digits than its factorization.

11515381398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309828 (or 2309825 counting only the distinct ones).

The product of its digits is 129600, while the sum is 45.

The spelling of 11515381398 in words is "eleven billion, five hundred fifteen million, three hundred eighty-one thousand, three hundred ninety-eight".