251430545320 has 128 divisors (see below), whose sum is σ = 593961984000. Its totient is φ = 95607072000.

The previous prime is 251430545279. The next prime is 251430545321. The reversal of 251430545320 is 23545034152.

It is not an unprimeable number, because it can be changed into a prime (251430545321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142938601 + ... + 142940359.

It is an arithmetic number, because the mean of its divisors is an integer number (4640328000).

Almost surely, 2^251430545320 is an apocalyptic number.

251430545320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251430545320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296980992000).

251430545320 is an abundant number, since it is smaller than the sum of its proper divisors (342531438680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251430545320 is a wasteful number, since it uses less digits than its factorization.

251430545320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663 (or 2659 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 251430545320 its reverse (23545034152), we get a palindrome (274975579472).

The spelling of 251430545320 in words is "two hundred fifty-one billion, four hundred thirty million, five hundred forty-five thousand, three hundred twenty".