163509163697 has 4 divisors (see below), whose sum is σ = 178373633136. Its totient is φ = 148644694260.

The previous prime is 163509163691. The next prime is 163509163729. The reversal of 163509163697 is 796361905361.

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: 796361905361 = 11 ⋅72396536851.

It is a cyclic number.

It is not a de Polignac number, because 163509163697 - 2¹² = 163509159601 is a prime.

It is a super-2 number, since 2×163509163697² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163509163691) 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, 7432234703 + ... + 7432234724.

It is an arithmetic number, because the mean of its divisors is an integer number (44593408284).

Almost surely, 2^163509163697 is an apocalyptic number.

It is an amenable number.

163509163697 is a deficient number, since it is larger than the sum of its proper divisors (14864469439).

163509163697 is a wasteful number, since it uses less digits than its factorization.

163509163697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14864469438.

The product of its (nonzero) digits is 5511240, while the sum is 56.

The spelling of 163509163697 in words is "one hundred sixty-three billion, five hundred nine million, one hundred sixty-three thousand, six hundred ninety-seven".