163436400981 has 12 divisors (see below), whose sum is σ = 269799773152. Its totient is φ = 93392229096.

The previous prime is 163436400947. The next prime is 163436400991. The reversal of 163436400981 is 189004634361.

163436400981 is a `hidden beast` number, since 1 + 634 + 3 + 6 + 4 + 0 + 0 + 9 + 8 + 1 = 666.

It is not a de Polignac number, because 163436400981 - 2¹⁰ = 163436399957 is a prime.

It is a super-2 number, since 2×163436400981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163436400931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1297114231 + ... + 1297114356.

Almost surely, 2^163436400981 is an apocalyptic number.

It is an amenable number.

163436400981 is a deficient number, since it is larger than the sum of its proper divisors (106363372171).

163436400981 is a wasteful number, since it uses less digits than its factorization.

163436400981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594228600 (or 2594228597 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 163436400981 in words is "one hundred sixty-three billion, four hundred thirty-six million, four hundred thousand, nine hundred eighty-one".