51623225064 has 24 divisors (see below), whose sum is σ = 139812901410. Its totient is φ = 17207741664.

The previous prime is 51623225057. The next prime is 51623225089. The reversal of 51623225064 is 46052232615.

51623225064 is a `hidden beast` number, since 5 + 1 + 623 + 2 + 25 + 0 + 6 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 45868788900 + 5754436164 = 214170^2 + 75858^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 358494547 + ... + 358494690.

Almost surely, 2^51623225064 is an apocalyptic number.

It is an amenable number.

51623225064 is an abundant number, since it is smaller than the sum of its proper divisors (88189676346).

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

51623225064 is a wasteful number, since it uses less digits than its factorization.

51623225064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716989249 (or 716989242 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 51623225064 its reverse (46052232615), we get a palindrome (97675457679).

The spelling of 51623225064 in words is "fifty-one billion, six hundred twenty-three million, two hundred twenty-five thousand, sixty-four".