17977637953 has 4 divisors (see below), whose sum is σ = 19611968688. Its totient is φ = 16343307220.

The previous prime is 17977637947. The next prime is 17977637963. The reversal of 17977637953 is 35973677971.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17977637953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17977637903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 817165351 + ... + 817165372.

It is an arithmetic number, because the mean of its divisors is an integer number (4902992172).

Almost surely, 2^17977637953 is an apocalyptic number.

It is an amenable number.

17977637953 is a deficient number, since it is larger than the sum of its proper divisors (1634330735).

17977637953 is a wasteful number, since it uses less digits than its factorization.

17977637953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634330734.

The product of its digits is 52509870, while the sum is 64.

The spelling of 17977637953 in words is "seventeen billion, nine hundred seventy-seven million, six hundred thirty-seven thousand, nine hundred fifty-three".