51521352225 has 48 divisors (see below), whose sum is σ = 97658237568. Its totient is φ = 23478243840.

The previous prime is 51521352221. The next prime is 51521352251. The reversal of 51521352225 is 52225312515.

It is not a de Polignac number, because 51521352225 - 2² = 51521352221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51521352221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11637 + ... + 321213.

It is an arithmetic number, because the mean of its divisors is an integer number (2034546616).

Almost surely, 2^51521352225 is an apocalyptic number.

It is an amenable number.

51521352225 is a deficient number, since it is larger than the sum of its proper divisors (46136885343).

51521352225 is a wasteful number, since it uses less digits than its factorization.

51521352225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309914 (or 309909 counting only the distinct ones).

The product of its digits is 30000, while the sum is 33.

The spelling of 51521352225 in words is "fifty-one billion, five hundred twenty-one million, three hundred fifty-two thousand, two hundred twenty-five".