51520552212 has 24 divisors (see below), whose sum is σ = 120221915296. Its totient is φ = 17172475488.

The previous prime is 51520552199. The next prime is 51520552219. The reversal of 51520552212 is 21225502515.

It is a self number, because there is not a number n which added to its sum of digits gives 51520552212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520552219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90798 + ... + 333594.

Almost surely, 2^51520552212 is an apocalyptic number.

It is an amenable number.

51520552212 is an abundant number, since it is smaller than the sum of its proper divisors (68701363084).

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

51520552212 is a wasteful number, since it uses less digits than its factorization.

51520552212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260487 (or 260485 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The spelling of 51520552212 in words is "fifty-one billion, five hundred twenty million, five hundred fifty-two thousand, two hundred twelve".