251220255026 has 8 divisors (see below), whose sum is σ = 405817335084. Its totient is φ = 115947810000.

The previous prime is 251220255001. The next prime is 251220255029. The reversal of 251220255026 is 620552022152.

It can be written as a sum of positive squares in 2 ways, for example, as 250099009801 + 1121245225 = 500099^2 + 33485^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×251220255026² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 251220254983 and 251220255001.

It is not an unprimeable number, because it can be changed into a prime (251220255029) 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, 4831158725 + ... + 4831158776.

Almost surely, 2^251220255026 is an apocalyptic number.

251220255026 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

251220255026 is a deficient number, since it is larger than the sum of its proper divisors (154597080058).

251220255026 is a wasteful number, since it uses less digits than its factorization.

251220255026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9662317516.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 251220255026 its reverse (620552022152), we get a palindrome (871772277178).

The spelling of 251220255026 in words is "two hundred fifty-one billion, two hundred twenty million, two hundred fifty-five thousand, twenty-six".