251220541552303 has 4 divisors (see below), whose sum is σ = 259883318847240. Its totient is φ = 242557764257368.

The previous prime is 251220541552259. The next prime is 251220541552313. The reversal of 251220541552303 is 303255145022152.

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 251220541552303 - 2³⁷ = 251083102598831 is a prime.

It is a super-2 number, since 2×251220541552303² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251220541552313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4331388647425 + ... + 4331388647482.

It is an arithmetic number, because the mean of its divisors is an integer number (64970829711810).

Almost surely, 2^{251220541552303} is an apocalyptic number.

251220541552303 is a deficient number, since it is larger than the sum of its proper divisors (8662777294937).

251220541552303 is an equidigital number, since it uses as much as digits as its factorization.

251220541552303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8662777294936.

The product of its (nonzero) digits is 360000, while the sum is 40.

Adding to 251220541552303 its reverse (303255145022152), we get a palindrome (554475686574455).

The spelling of 251220541552303 in words is "two hundred fifty-one trillion, two hundred twenty billion, five hundred forty-one million, five hundred fifty-two thousand, three hundred three".