163771567969 has 9 divisors (see below), whose sum is σ = 165419122323. Its totient is φ = 162140274672.

The previous prime is 163771567961. The next prime is 163771567979. The reversal of 163771567969 is 969765177361.

The square root of 163771567969 is 404687.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 23206561569 + 140565006400 = 152337^2 + 374920^2 .

It is not a de Polignac number, because 163771567969 - 2³ = 163771567961 is a prime.

It is a super-2 number, since 2×163771567969² (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 (163771567961) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 41680797 + ... + 41684725.

Almost surely, 2^163771567969 is an apocalyptic number.

163771567969 is the 404687-th square number.

163771567969 is the 202344-th centered octagonal number.

It is an amenable number.

163771567969 is a deficient number, since it is larger than the sum of its proper divisors (1647554354).

163771567969 is an frugal number, since it uses more digits than its factorization.

163771567969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8064 (or 4032 counting only the distinct ones).

The product of its digits is 90016920, while the sum is 67.

The spelling of 163771567969 in words is "one hundred sixty-three billion, seven hundred seventy-one million, five hundred sixty-seven thousand, nine hundred sixty-nine".