15815252481 has 8 divisors (see below), whose sum is σ = 24099432384. Its totient is φ = 9037287120.

The previous prime is 15815252461. The next prime is 15815252501. The reversal of 15815252481 is 18425251851.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (15815252461) and next prime (15815252501).

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

It is not a de Polignac number, because 15815252481 - 2¹⁰ = 15815251457 is a prime.

It is a super-2 number, since 2×15815252481² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (15815252461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376553610 + ... + 376553651.

It is an arithmetic number, because the mean of its divisors is an integer number (3012429048).

Almost surely, 2^15815252481 is an apocalyptic number.

It is an amenable number.

15815252481 is a deficient number, since it is larger than the sum of its proper divisors (8284179903).

15815252481 is an equidigital number, since it uses as much as digits as its factorization.

15815252481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753107271.

The product of its digits is 128000, while the sum is 42.

The spelling of 15815252481 in words is "fifteen billion, eight hundred fifteen million, two hundred fifty-two thousand, four hundred eighty-one".