15826721993453 has 12 divisors (see below), whose sum is σ = 19045527523740. Its totient is φ = 13097976820992.

The previous prime is 15826721993417. The next prime is 15826721993461. The reversal of 15826721993453 is 35439912762851.

It can be written as a sum of positive squares in 2 ways, for example, as 6733469681449 + 9093252312004 = 2594893^2 + 3015502^2 .

It is not a de Polignac number, because 15826721993453 - 2¹⁸ = 15826721731309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15826721993453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15826721993473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5568866276 + ... + 5568869117.

It is an arithmetic number, because the mean of its divisors is an integer number (1587127293645).

Almost surely, 2^{15826721993453} is an apocalyptic number.

It is an amenable number.

15826721993453 is a deficient number, since it is larger than the sum of its proper divisors (3218805530287).

15826721993453 is a wasteful number, since it uses less digits than its factorization.

15826721993453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11137735436 (or 11137735429 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 65.

The spelling of 15826721993453 in words is "fifteen trillion, eight hundred twenty-six billion, seven hundred twenty-one million, nine hundred ninety-three thousand, four hundred fifty-three".