15540379774128 has 160 divisors (see below), whose sum is σ = 49347173721600. Its totient is φ = 4642879046400.

The previous prime is 15540379774111. The next prime is 15540379774141. The reversal of 15540379774128 is 82147797304551.

15540379774128 is a `hidden beast` number, since 1 + 5 + 540 + 3 + 7 + 9 + 7 + 74 + 12 + 8 = 666.

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 31 ways as a sum of consecutive naturals, for example, 22692763 + ... + 23367546.

It is an arithmetic number, because the mean of its divisors is an integer number (308419835760).

Almost surely, 2^{15540379774128} is an apocalyptic number.

15540379774128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

15540379774128 is an abundant number, since it is smaller than the sum of its proper divisors (33806793947472).

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

15540379774128 is a wasteful number, since it uses less digits than its factorization.

15540379774128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46060408 (or 46060396 counting only the distinct ones).

The product of its (nonzero) digits is 59270400, while the sum is 63.

The spelling of 15540379774128 in words is "fifteen trillion, five hundred forty billion, three hundred seventy-nine million, seven hundred seventy-four thousand, one hundred twenty-eight".