163556893949 has 2 divisors, whose sum is σ = 163556893950. Its totient is φ = 163556893948.

The previous prime is 163556893909. The next prime is 163556893987. The reversal of 163556893949 is 949398655361.

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., 149185200025 + 14371693924 = 386245^2 + 119882^2 .

It is a cyclic number.

It is not a de Polignac number, because 163556893949 - 2²⁸ = 163288458493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163556893909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81778446974 + 81778446975.

It is an arithmetic number, because the mean of its divisors is an integer number (81778446975).

Almost surely, 2^163556893949 is an apocalyptic number.

It is an amenable number.

163556893949 is a deficient number, since it is larger than the sum of its proper divisors (1).

163556893949 is an equidigital number, since it uses as much as digits as its factorization.

163556893949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188956800, while the sum is 68.

The spelling of 163556893949 in words is "one hundred sixty-three billion, five hundred fifty-six million, eight hundred ninety-three thousand, nine hundred forty-nine".