163640677 has 6 divisors (see below), whose sum is σ = 168184338. Its totient is φ = 159216624.

The previous prime is 163640641. The next prime is 163640693. The reversal of 163640677 is 776046361.

163640677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 89094721 + 74545956 = 9439^2 + 8634^2 .

It is not a de Polignac number, because 163640677 - 2²⁷ = 29422949 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 (163640077) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58398 + ... + 61135.

It is an arithmetic number, because the mean of its divisors is an integer number (28030723).

Almost surely, 2^163640677 is an apocalyptic number.

It is an amenable number.

163640677 is a deficient number, since it is larger than the sum of its proper divisors (4543661).

163640677 is an equidigital number, since it uses as much as digits as its factorization.

163640677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119607 (or 119570 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 163640677 is about 12792.2115757988. The cubic root of 163640677 is about 546.9703134529.

The spelling of 163640677 in words is "one hundred sixty-three million, six hundred forty thousand, six hundred seventy-seven".