201545254251 has 24 divisors (see below), whose sum is σ = 317684478384. Its totient is φ = 122110940160.

The previous prime is 201545254199. The next prime is 201545254277. The reversal of 201545254251 is 152452545102.

201545254251 is a `hidden beast` number, since 2 + 0 + 1 + 545 + 25 + 42 + 51 = 666.

201545254251 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 201545254251 - 2²² = 201541059947 is a prime.

It is a super-2 number, since 2×201545254251² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201545234251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9915 + ... + 634971.

It is an arithmetic number, because the mean of its divisors is an integer number (13236853266).

Almost surely, 2^201545254251 is an apocalyptic number.

201545254251 is a deficient number, since it is larger than the sum of its proper divisors (116139224133).

201545254251 is a wasteful number, since it uses less digits than its factorization.

201545254251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628331 (or 628328 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 36.

Adding to 201545254251 its reverse (152452545102), we get a palindrome (353997799353).

The spelling of 201545254251 in words is "two hundred one billion, five hundred forty-five million, two hundred fifty-four thousand, two hundred fifty-one".