15623131643 has 4 divisors (see below), whose sum is σ = 17855007600. Its totient is φ = 13391255688.

The previous prime is 15623131607. The next prime is 15623131669. The reversal of 15623131643 is 34613132651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34613132651 = 19429 ⋅1781519.

It is a cyclic number.

It is not a de Polignac number, because 15623131643 - 2¹⁰ = 15623130619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15623131603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115937968 + ... + 1115937981.

It is an arithmetic number, because the mean of its divisors is an integer number (4463751900).

Almost surely, 2^15623131643 is an apocalyptic number.

15623131643 is a deficient number, since it is larger than the sum of its proper divisors (2231875957).

15623131643 is an equidigital number, since it uses as much as digits as its factorization.

15623131643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231875956.

The product of its digits is 38880, while the sum is 35.

The spelling of 15623131643 in words is "fifteen billion, six hundred twenty-three million, one hundred thirty-one thousand, six hundred forty-three".