163574661881 has 2 divisors, whose sum is σ = 163574661882. Its totient is φ = 163574661880.

The previous prime is 163574661863. The next prime is 163574661893. The reversal of 163574661881 is 188166475361.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88040384656 + 75534277225 = 296716^2 + 274835^2 .

It is a cyclic number.

It is not a de Polignac number, because 163574661881 - 2³⁴ = 146394792697 is a prime.

It is a super-2 number, since 2×163574661881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (163574661581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81787330940 + 81787330941.

It is an arithmetic number, because the mean of its divisors is an integer number (81787330941).

Almost surely, 2^163574661881 is an apocalyptic number.

It is an amenable number.

163574661881 is a deficient number, since it is larger than the sum of its proper divisors (1).

163574661881 is an equidigital number, since it uses as much as digits as its factorization.

163574661881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 56.

The spelling of 163574661881 in words is "one hundred sixty-three billion, five hundred seventy-four million, six hundred sixty-one thousand, eight hundred eighty-one".