251563534225212 has 48 divisors (see below), whose sum is σ = 642429351349632. Its totient is φ = 75983063330880.

The previous prime is 251563534225193. The next prime is 251563534225217. The reversal of 251563534225212 is 212522435365152.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251563534225217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3103842783 + ... + 3103923830.

It is an arithmetic number, because the mean of its divisors is an integer number (13383944819784).

Almost surely, 2^{251563534225212} is an apocalyptic number.

251563534225212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

251563534225212 is an abundant number, since it is smaller than the sum of its proper divisors (390865817124420).

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

251563534225212 is a wasteful number, since it uses less digits than its factorization.

251563534225212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6207766938 (or 6207766936 counting only the distinct ones).

The product of its digits is 4320000, while the sum is 48.

The spelling of 251563534225212 in words is "two hundred fifty-one trillion, five hundred sixty-three billion, five hundred thirty-four million, two hundred twenty-five thousand, two hundred twelve".