201545198523 has 12 divisors (see below), whose sum is σ = 293215238680. Its totient is φ = 133396821216.

The previous prime is 201545198501. The next prime is 201545198633. The reversal of 201545198523 is 325891545102.

201545198523 is a `hidden beast` number, since 2 + 0 + 1 + 54 + 519 + 85 + 2 + 3 = 666.

It is not a de Polignac number, because 201545198523 - 2¹⁰ = 201545197499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201545198923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80552386 + ... + 80554887.

Almost surely, 2^201545198523 is an apocalyptic number.

201545198523 is a deficient number, since it is larger than the sum of its proper divisors (91670040157).

201545198523 is a wasteful number, since it uses less digits than its factorization.

201545198523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161107418 (or 161107415 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 201545198523 in words is "two hundred one billion, five hundred forty-five million, one hundred ninety-eight thousand, five hundred twenty-three".