15481218451 has 4 divisors (see below), whose sum is σ = 16015053600. Its totient is φ = 14947383304.

The previous prime is 15481218427. The next prime is 15481218457.

15481218451 is nontrivially palindromic in base 10.

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 15481218451 - 2⁷ = 15481218323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15481218457) 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, 266917531 + ... + 266917588.

It is an arithmetic number, because the mean of its divisors is an integer number (4003763400).

Almost surely, 2^15481218451 is an apocalyptic number.

15481218451 is a deficient number, since it is larger than the sum of its proper divisors (533835149).

15481218451 is an equidigital number, since it uses as much as digits as its factorization.

15481218451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533835148.

The product of its digits is 51200, while the sum is 40.

The spelling of 15481218451 in words is "fifteen billion, four hundred eighty-one million, two hundred eighteen thousand, four hundred fifty-one".