251427201536 has 160 divisors (see below), whose sum is σ = 582783949440. Its totient is φ = 106138238976.

The previous prime is 251427201517. The next prime is 251427201581. The reversal of 251427201536 is 635102724152.

It is a self number, because there is not a number n which added to its sum of digits gives 251427201536.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118095320 + ... + 118097448.

It is an arithmetic number, because the mean of its divisors is an integer number (3642399684).

Almost surely, 2^251427201536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251427201536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291391974720).

251427201536 is an abundant number, since it is smaller than the sum of its proper divisors (331356747904).

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

251427201536 is an equidigital number, since it uses as much as digits as its factorization.

251427201536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634 (or 2618 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 38.

Adding to 251427201536 its reverse (635102724152), we get a palindrome (886529925688).

The spelling of 251427201536 in words is "two hundred fifty-one billion, four hundred twenty-seven million, two hundred one thousand, five hundred thirty-six".