15641385537 has 4 divisors (see below), whose sum is σ = 20855180720. Its totient is φ = 10427590356.

The previous prime is 15641385481. The next prime is 15641385553. The reversal of 15641385537 is 73558314651.

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 15641385537 - 2¹⁰ = 15641384513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15641385337) 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, 2606897587 + ... + 2606897592.

It is an arithmetic number, because the mean of its divisors is an integer number (5213795180).

Almost surely, 2^15641385537 is an apocalyptic number.

It is an amenable number.

15641385537 is a deficient number, since it is larger than the sum of its proper divisors (5213795183).

15641385537 is an equidigital number, since it uses as much as digits as its factorization.

15641385537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5213795182.

The product of its digits is 1512000, while the sum is 48.

The spelling of 15641385537 in words is "fifteen billion, six hundred forty-one million, three hundred eighty-five thousand, five hundred thirty-seven".