19903540523 has 8 divisors (see below), whose sum is σ = 20233603728. Its totient is φ = 19574447904.

The previous prime is 19903540477. The next prime is 19903540537. The reversal of 19903540523 is 32504530991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19903540523 - 2²² = 19899346219 is a prime.

It is a super-2 number, since 2×19903540523² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19903540583) 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 7 ways as a sum of consecutive naturals, for example, 201236 + ... + 283377.

It is an arithmetic number, because the mean of its divisors is an integer number (2529200466).

Almost surely, 2^19903540523 is an apocalyptic number.

19903540523 is a deficient number, since it is larger than the sum of its proper divisors (330063205).

19903540523 is an equidigital number, since it uses as much as digits as its factorization.

19903540523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485293.

The product of its (nonzero) digits is 145800, while the sum is 41.

The spelling of 19903540523 in words is "nineteen billion, nine hundred three million, five hundred forty thousand, five hundred twenty-three".