201016236543561 has 24 divisors (see below), whose sum is σ = 292206391626240. Its totient is φ = 133157769855936.

The previous prime is 201016236543553. The next prime is 201016236543587. The reversal of 201016236543561 is 165345632610102.

It is a happy number.

201016236543561 is a `hidden beast` number, since 2 + 0 + 1 + 0 + 1 + 6 + 2 + 36 + 54 + 3 + 561 = 666.

It is not a de Polignac number, because 201016236543561 - 2³ = 201016236543553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201016236043561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21440121 + ... + 29354918.

It is an arithmetic number, because the mean of its divisors is an integer number (12175266317760).

Almost surely, 2^{201016236543561} is an apocalyptic number.

It is an amenable number.

201016236543561 is a deficient number, since it is larger than the sum of its proper divisors (91190155082679).

201016236543561 is a wasteful number, since it uses less digits than its factorization.

201016236543561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50797845 (or 50797842 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 201016236543561 in words is "two hundred one trillion, sixteen billion, two hundred thirty-six million, five hundred forty-three thousand, five hundred sixty-one".