163976308981 has 2 divisors, whose sum is σ = 163976308982. Its totient is φ = 163976308980.

The previous prime is 163976308967. The next prime is 163976309111. The reversal of 163976308981 is 189803679361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141368480100 + 22607828881 = 375990^2 + 150359^2 .

It is a cyclic number.

It is not a de Polignac number, because 163976308981 - 2²³ = 163967920373 is a prime.

It is a super-2 number, since 2×163976308981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163976308681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81988154490 + 81988154491.

It is an arithmetic number, because the mean of its divisors is an integer number (81988154491).

Almost surely, 2^163976308981 is an apocalyptic number.

It is an amenable number.

163976308981 is a deficient number, since it is larger than the sum of its proper divisors (1).

163976308981 is an equidigital number, since it uses as much as digits as its factorization.

163976308981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11757312, while the sum is 61.

The spelling of 163976308981 in words is "one hundred sixty-three billion, nine hundred seventy-six million, three hundred eight thousand, nine hundred eighty-one".