15823811397 has 4 divisors (see below), whose sum is σ = 21098415200. Its totient is φ = 10549207596.

The previous prime is 15823811369. The next prime is 15823811413. The reversal of 15823811397 is 79311832851.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 15823811397 - 2¹⁸ = 15823549253 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 (15823811897) 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, 2637301897 + ... + 2637301902.

It is an arithmetic number, because the mean of its divisors is an integer number (5274603800).

Almost surely, 2^15823811397 is an apocalyptic number.

It is an amenable number.

15823811397 is a deficient number, since it is larger than the sum of its proper divisors (5274603803).

15823811397 is an equidigital number, since it uses as much as digits as its factorization.

15823811397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5274603802.

The product of its digits is 362880, while the sum is 48.

The spelling of 15823811397 in words is "fifteen billion, eight hundred twenty-three million, eight hundred eleven thousand, three hundred ninety-seven".