202105405115551 has 12 divisors (see below), whose sum is σ = 247476006265080. Its totient is φ = 164115667311120.

The previous prime is 202105405115543. The next prime is 202105405115561. The reversal of 202105405115551 is 155511504501202.

202105405115551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 202105405115551 - 2³ = 202105405115543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202105405115551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202105405115561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108542107080 + ... + 108542108941.

It is an arithmetic number, because the mean of its divisors is an integer number (20623000522090).

Almost surely, 2^{202105405115551} is an apocalyptic number.

202105405115551 is a deficient number, since it is larger than the sum of its proper divisors (45370601149529).

202105405115551 is a wasteful number, since it uses less digits than its factorization.

202105405115551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217084216054 (or 217084216047 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 37.

Adding to 202105405115551 its reverse (155511504501202), we get a palindrome (357616909616753).

The spelling of 202105405115551 in words is "two hundred two trillion, one hundred five billion, four hundred five million, one hundred fifteen thousand, five hundred fifty-one".