165548631563 has 4 divisors (see below), whose sum is σ = 189198436080. Its totient is φ = 141898827048.

The previous prime is 165548631553. The next prime is 165548631571. The reversal of 165548631563 is 365136845561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165548631563 - 2¹⁰ = 165548630539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165548631533) 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, 11824902248 + ... + 11824902261.

It is an arithmetic number, because the mean of its divisors is an integer number (47299609020).

Almost surely, 2^165548631563 is an apocalyptic number.

165548631563 is a deficient number, since it is larger than the sum of its proper divisors (23649804517).

165548631563 is an equidigital number, since it uses as much as digits as its factorization.

165548631563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23649804516.

The product of its digits is 7776000, while the sum is 53.

The spelling of 165548631563 in words is "one hundred sixty-five billion, five hundred forty-eight million, six hundred thirty-one thousand, five hundred sixty-three".