15687481813 has 8 divisors (see below), whose sum is σ = 15946890296. Its totient is φ = 15428145600.

The previous prime is 15687481811. The next prime is 15687481853. The reversal of 15687481813 is 31818478651.

It can be written as a sum of positive squares in 4 ways, for example, as 2440162404 + 13247319409 = 49398^2 + 115097^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 15687481813 - 2¹ = 15687481811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15687481811) 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, 583495 + ... + 609787.

It is an arithmetic number, because the mean of its divisors is an integer number (1993361287).

Almost surely, 2^15687481813 is an apocalyptic number.

It is an amenable number.

15687481813 is a deficient number, since it is larger than the sum of its proper divisors (259408483).

15687481813 is an equidigital number, since it uses as much as digits as its factorization.

15687481813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36135.

The product of its digits is 1290240, while the sum is 52.

The spelling of 15687481813 in words is "fifteen billion, six hundred eighty-seven million, four hundred eighty-one thousand, eight hundred thirteen".