163243252251 has 6 divisors (see below), whose sum is σ = 235795808820. Its totient is φ = 108828834828.

The previous prime is 163243252247. The next prime is 163243252259. The reversal of 163243252251 is 152252342361.

163243252251 is a `hidden beast` number, since 1 + 6 + 324 + 32 + 52 + 251 = 666.

It is not a de Polignac number, because 163243252251 - 2² = 163243252247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163243252259) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9069069561 + ... + 9069069578.

It is an arithmetic number, because the mean of its divisors is an integer number (39299301470).

Almost surely, 2^163243252251 is an apocalyptic number.

163243252251 is a deficient number, since it is larger than the sum of its proper divisors (72552556569).

163243252251 is a wasteful number, since it uses less digits than its factorization.

163243252251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18138139145 (or 18138139142 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The spelling of 163243252251 in words is "one hundred sixty-three billion, two hundred forty-three million, two hundred fifty-two thousand, two hundred fifty-one".