163948677661 has 4 divisors (see below), whose sum is σ = 164725685824. Its totient is φ = 163171669500.

The previous prime is 163948677647. The next prime is 163948677667. The reversal of 163948677661 is 166776849361.

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, and also an emirpimes, since its reverse is a distinct semiprime: 166776849361 = 79 ⋅2111099359.

It is a cyclic number.

It is not a de Polignac number, because 163948677661 - 2⁹ = 163948677149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163948677593 and 163948677602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163948677667) 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, 388503765 + ... + 388504186.

It is an arithmetic number, because the mean of its divisors is an integer number (41181421456).

Almost surely, 2^163948677661 is an apocalyptic number.

It is an amenable number.

163948677661 is a deficient number, since it is larger than the sum of its proper divisors (777008163).

163948677661 is an equidigital number, since it uses as much as digits as its factorization.

163948677661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777008162.

The product of its digits is 54867456, while the sum is 64.

The spelling of 163948677661 in words is "one hundred sixty-three billion, nine hundred forty-eight million, six hundred seventy-seven thousand, six hundred sixty-one".