15540412340 has 12 divisors (see below), whose sum is σ = 32634865956. Its totient is φ = 6216164928.

The previous prime is 15540412319. The next prime is 15540412357. The reversal of 15540412340 is 4321404551.

It can be written as a sum of positive squares in 2 ways, for example, as 3840528784 + 11699883556 = 61972^2 + 108166^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388510289 + ... + 388510328.

It is an arithmetic number, because the mean of its divisors is an integer number (2719572163).

Almost surely, 2^15540412340 is an apocalyptic number.

15540412340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15540412340 is an abundant number, since it is smaller than the sum of its proper divisors (17094453616).

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

15540412340 is a wasteful number, since it uses less digits than its factorization.

15540412340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777020626 (or 777020624 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 15540412340 its reverse (4321404551), we get a palindrome (19861816891).

The spelling of 15540412340 in words is "fifteen billion, five hundred forty million, four hundred twelve thousand, three hundred forty".