15540111442 has 8 divisors (see below), whose sum is σ = 23314642416. Its totient is φ = 7768563972.

The previous prime is 15540111373. The next prime is 15540111467. The reversal of 15540111442 is 24411104551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 15540111442.

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, 732808 + ... + 753715.

It is an arithmetic number, because the mean of its divisors is an integer number (2914330302).

Almost surely, 2^15540111442 is an apocalyptic number.

15540111442 is a deficient number, since it is larger than the sum of its proper divisors (7774530974).

15540111442 is a wasteful number, since it uses less digits than its factorization.

15540111442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491752.

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 15540111442 its reverse (24411104551), we get a palindrome (39951215993).

It can be divided in two parts, 155401114 and 42, that added together give a square (155401156 = 12466²).

The spelling of 15540111442 in words is "fifteen billion, five hundred forty million, one hundred eleven thousand, four hundred forty-two".