202136561645 has 4 divisors (see below), whose sum is σ = 242563873980. Its totient is φ = 161709249312.

The previous prime is 202136561639. The next prime is 202136561659. The reversal of 202136561645 is 546165631202.

It is a happy number.

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 159823248841 + 42313312804 = 399779^2 + 205702^2 .

It is a cyclic number.

It is not a de Polignac number, because 202136561645 - 2²⁸ = 201868126189 is a prime.

It is a super-3 number, since 3×202136561645³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

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, 20213656160 + ... + 20213656169.

It is an arithmetic number, because the mean of its divisors is an integer number (60640968495).

Almost surely, 2^202136561645 is an apocalyptic number.

It is an amenable number.

202136561645 is a deficient number, since it is larger than the sum of its proper divisors (40427312335).

202136561645 is an equidigital number, since it uses as much as digits as its factorization.

202136561645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40427312334.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 202136561645 in words is "two hundred two billion, one hundred thirty-six million, five hundred sixty-one thousand, six hundred forty-five".