202540204451 has 4 divisors (see below), whose sum is σ = 218120220192. Its totient is φ = 186960188712.

The previous prime is 202540204429. The next prime is 202540204453. The reversal of 202540204451 is 154402045202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202540204451 is a prime.

It is a super-2 number, since 2×202540204451² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202540204453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7790007851 + ... + 7790007876.

It is an arithmetic number, because the mean of its divisors is an integer number (54530055048).

Almost surely, 2^202540204451 is an apocalyptic number.

202540204451 is a deficient number, since it is larger than the sum of its proper divisors (15580015741).

202540204451 is a wasteful number, since it uses less digits than its factorization.

202540204451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15580015740.

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 202540204451 its reverse (154402045202), we get a palindrome (356942249653).

The spelling of 202540204451 in words is "two hundred two billion, five hundred forty million, two hundred four thousand, four hundred fifty-one".