236561204545 has 4 divisors (see below), whose sum is σ = 283873445460. Its totient is φ = 189248963632.

The previous prime is 236561204441. The next prime is 236561204599. The reversal of 236561204545 is 545402165632.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 183125796624 + 53435407921 = 427932^2 + 231161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-236561204545 is a prime.

It is a super-2 number, since 2×236561204545² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23656120450 + ... + 23656120459.

It is an arithmetic number, because the mean of its divisors is an integer number (70968361365).

Almost surely, 2^236561204545 is an apocalyptic number.

It is an amenable number.

236561204545 is a deficient number, since it is larger than the sum of its proper divisors (47312240915).

236561204545 is an equidigital number, since it uses as much as digits as its factorization.

236561204545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47312240914.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 236561204545 in words is "two hundred thirty-six billion, five hundred sixty-one million, two hundred four thousand, five hundred forty-five".