201565966545 has 24 divisors (see below), whose sum is σ = 349900200936. Its totient is φ = 107342097408.

The previous prime is 201565966529. The next prime is 201565966561. The reversal of 201565966545 is 545669565102.

It is a happy number.

201565966545 is a `hidden beast` number, since 2 + 0 + 1 + 5 + 6 + 5 + 96 + 6 + 545 = 666.

It is an interprime number because it is at equal distance from previous prime (201565966529) and next prime (201565966561).

It can be written as a sum of positive squares in 4 ways, for example, as 112211649 + 201453754896 = 10593^2 + 448836^2 .

It is not a de Polignac number, because 201565966545 - 2⁴ = 201565966529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201565966491 and 201565966500.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3297534 + ... + 3358103.

It is an arithmetic number, because the mean of its divisors is an integer number (14579175039).

Almost surely, 2^201565966545 is an apocalyptic number.

It is an amenable number.

201565966545 is a deficient number, since it is larger than the sum of its proper divisors (148334234391).

201565966545 is a wasteful number, since it uses less digits than its factorization.

201565966545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6656321 (or 6656318 counting only the distinct ones).

The product of its (nonzero) digits is 9720000, while the sum is 54.

The spelling of 201565966545 in words is "two hundred one billion, five hundred sixty-five million, nine hundred sixty-six thousand, five hundred forty-five".