163540810973 has 4 divisors (see below), whose sum is σ = 163699435488. Its totient is φ = 163382186460.

The previous prime is 163540810813. The next prime is 163540810991. The reversal of 163540810973 is 379018045361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 379018045361 = 107 ⋅3542224723.

It is a cyclic number.

It is not a de Polignac number, because 163540810973 - 2²⁶ = 163473702109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163540210973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79310711 + ... + 79312772.

It is an arithmetic number, because the mean of its divisors is an integer number (40924858872).

Almost surely, 2^163540810973 is an apocalyptic number.

It is an amenable number.

163540810973 is a deficient number, since it is larger than the sum of its proper divisors (158624515).

163540810973 is a wasteful number, since it uses less digits than its factorization.

163540810973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158624514.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 163540810973 in words is "one hundred sixty-three billion, five hundred forty million, eight hundred ten thousand, nine hundred seventy-three".