15438081285 has 48 divisors (see below), whose sum is σ = 29202675840. Its totient is φ = 7482395520.

The previous prime is 15438081277. The next prime is 15438081289. The reversal of 15438081285 is 58218083451.

15438081285 is a `hidden beast` number, since 1 + 543 + 8 + 0 + 81 + 28 + 5 = 666.

It is not a de Polignac number, because 15438081285 - 2³ = 15438081277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15438081285.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15438081289) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2257251 + ... + 2264079.

It is an arithmetic number, because the mean of its divisors is an integer number (608389080).

Almost surely, 2^15438081285 is an apocalyptic number.

15438081285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15438081285 is a deficient number, since it is larger than the sum of its proper divisors (13764594555).

15438081285 is a wasteful number, since it uses less digits than its factorization.

15438081285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11418 (or 11415 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

The spelling of 15438081285 in words is "fifteen billion, four hundred thirty-eight million, eighty-one thousand, two hundred eighty-five".