15540335540 has 12 divisors (see below), whose sum is σ = 32634704676. Its totient is φ = 6216134208.

The previous prime is 15540335537. The next prime is 15540335561. The reversal of 15540335540 is 4553304551.

It can be written as a sum of positive squares in 2 ways, for example, as 12028824976 + 3511510564 = 109676^2 + 59258^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 15540335540.

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 3 ways as a sum of consecutive naturals, for example, 388508369 + ... + 388508408.

It is an arithmetic number, because the mean of its divisors is an integer number (2719558723).

Almost surely, 2^15540335540 is an apocalyptic number.

15540335540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15540335540 is an abundant number, since it is smaller than the sum of its proper divisors (17094369136).

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

15540335540 is a wasteful number, since it uses less digits than its factorization.

15540335540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777016786 (or 777016784 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 35.

The spelling of 15540335540 in words is "fifteen billion, five hundred forty million, three hundred thirty-five thousand, five hundred forty".