18693956523 has 16 divisors (see below), whose sum is σ = 27199218816. Its totient is φ = 11326333440.

The previous prime is 18693956521. The next prime is 18693956543. The reversal of 18693956523 is 32565939681.

It is not a de Polignac number, because 18693956523 - 2¹ = 18693956521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18693956521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32715 + ... + 196107.

It is an arithmetic number, because the mean of its divisors is an integer number (1699951176).

Almost surely, 2^18693956523 is an apocalyptic number.

18693956523 is a deficient number, since it is larger than the sum of its proper divisors (8505262293).

18693956523 is a wasteful number, since it uses less digits than its factorization.

18693956523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166874.

The product of its digits is 10497600, while the sum is 57.

The spelling of 18693956523 in words is "eighteen billion, six hundred ninety-three million, nine hundred fifty-six thousand, five hundred twenty-three".