15540521042 has 8 divisors (see below), whose sum is σ = 23313394956. Its totient is φ = 7769389392.

The previous prime is 15540521033. The next prime is 15540521047. The reversal of 15540521042 is 24012504551.

It can be written as a sum of positive squares in 2 ways, for example, as 14551355641 + 989165401 = 120629^2 + 31451^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 15540520996 and 15540521014.

It is not an unprimeable number, because it can be changed into a prime (15540521047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413033 + ... + 449084.

Almost surely, 2^15540521042 is an apocalyptic number.

15540521042 is a deficient number, since it is larger than the sum of its proper divisors (7772873914).

15540521042 is an equidigital number, since it uses as much as digits as its factorization.

15540521042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871132.

The product of its (nonzero) digits is 8000, while the sum is 29.

The spelling of 15540521042 in words is "fifteen billion, five hundred forty million, five hundred twenty-one thousand, forty-two".