15493968481 has 4 divisors (see below), whose sum is σ = 15494249412. Its totient is φ = 15493687552.

The previous prime is 15493968473. The next prime is 15493968493. The reversal of 15493968481 is 18486939451.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5642413456 + 9851555025 = 75116^2 + 99255^2 .

It is a cyclic number.

It is not a de Polignac number, because 15493968481 - 2³ = 15493968473 is a prime.

It is a super-2 number, since 2×15493968481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15493963481) 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, 27400 + ... + 178153.

It is an arithmetic number, because the mean of its divisors is an integer number (3873562353).

Almost surely, 2^15493968481 is an apocalyptic number.

It is an amenable number.

15493968481 is a deficient number, since it is larger than the sum of its proper divisors (280931).

15493968481 is an equidigital number, since it uses as much as digits as its factorization.

15493968481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280930.

The product of its digits is 7464960, while the sum is 58.

The spelling of 15493968481 in words is "fifteen billion, four hundred ninety-three million, nine hundred sixty-eight thousand, four hundred eighty-one".