15540451015 has 4 divisors (see below), whose sum is σ = 18648541224. Its totient is φ = 12432360808.

The previous prime is 15540450997. The next prime is 15540451019. The reversal of 15540451015 is 51015404551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15540451015 - 2¹¹ = 15540448967 is a prime.

It is a super-2 number, since 2×15540451015² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15540451019) by changing a digit.

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, 1554045097 + ... + 1554045106.

It is an arithmetic number, because the mean of its divisors is an integer number (4662135306).

Almost surely, 2^15540451015 is an apocalyptic number.

15540451015 is a deficient number, since it is larger than the sum of its proper divisors (3108090209).

15540451015 is an equidigital number, since it uses as much as digits as its factorization.

15540451015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3108090208.

The product of its (nonzero) digits is 10000, while the sum is 31.

Adding to 15540451015 its reverse (51015404551), we get a palindrome (66555855566).

The spelling of 15540451015 in words is "fifteen billion, five hundred forty million, four hundred fifty-one thousand, fifteen".