251205232012 has 18 divisors (see below), whose sum is σ = 511382079852. Its totient is φ = 107659385064.

The previous prime is 251205231983. The next prime is 251205232079. The reversal of 251205232012 is 210232502152.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 640829478 + ... + 640829869.

Almost surely, 2^251205232012 is an apocalyptic number.

It is an amenable number.

251205232012 is an abundant number, since it is smaller than the sum of its proper divisors (260176847840).

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

251205232012 is a wasteful number, since it uses less digits than its factorization.

251205232012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281659365 (or 1281659356 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 251205232012 its reverse (210232502152), we get a palindrome (461437734164).

The spelling of 251205232012 in words is "two hundred fifty-one billion, two hundred five million, two hundred thirty-two thousand, twelve".