202520212154551 has 4 divisors (see below), whose sum is σ = 202521567870000. Its totient is φ = 202518856439104.

The previous prime is 202520212154549. The next prime is 202520212154563. The reversal of 202520212154551 is 155451212025202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 202520212154551 - 2¹ = 202520212154549 is a prime.

It is a super-2 number, since 2×202520212154551² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202520212154551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202520212124551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 677633626 + ... + 677932423.

It is an arithmetic number, because the mean of its divisors is an integer number (50630391967500).

Almost surely, 2^{202520212154551} is an apocalyptic number.

202520212154551 is a deficient number, since it is larger than the sum of its proper divisors (1355715449).

202520212154551 is a wasteful number, since it uses less digits than its factorization.

202520212154551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355715448.

The product of its (nonzero) digits is 80000, while the sum is 37.

Adding to 202520212154551 its reverse (155451212025202), we get a palindrome (357971424179753).

The spelling of 202520212154551 in words is "two hundred two trillion, five hundred twenty billion, two hundred twelve million, one hundred fifty-four thousand, five hundred fifty-one".