163538257745 has 16 divisors (see below), whose sum is σ = 199482001680. Its totient is φ = 128673619200.

The previous prime is 163538257709. The next prime is 163538257777. The reversal of 163538257745 is 547752835361.

It can be written as a sum of positive squares in 8 ways, for example, as 58139336641 + 105398921104 = 241121^2 + 324652^2 .

It is not a de Polignac number, because 163538257745 - 2⁸ = 163538257489 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4517015 + ... + 4553075.

It is an arithmetic number, because the mean of its divisors is an integer number (12467625105).

Almost surely, 2^163538257745 is an apocalyptic number.

It is an amenable number.

163538257745 is a deficient number, since it is larger than the sum of its proper divisors (35943743935).

163538257745 is a wasteful number, since it uses less digits than its factorization.

163538257745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50996.

The product of its digits is 21168000, while the sum is 56.

The spelling of 163538257745 in words is "one hundred sixty-three billion, five hundred thirty-eight million, two hundred fifty-seven thousand, seven hundred forty-five".