51649622802 has 162 divisors, whose sum is σ = 125184551583. Its totient is φ = 15386156544.

The previous prime is 51649622797. The next prime is 51649622803. The reversal of 51649622802 is 20822694615.

51649622802 is a `hidden beast` number, since 5 + 16 + 4 + 9 + 622 + 8 + 0 + 2 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 43739121321 + 7910501481 = 209139^2 + 88941^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=160701.

It is not an unprimeable number, because it can be changed into a prime (51649622803) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 377004478 + ... + 377004614.

Almost surely, 2^51649622802 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51649622802

51649622802 is an abundant number, since it is smaller than the sum of its proper divisors (73534928781).

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

51649622802 is a wasteful number, since it uses less digits than its factorization.

51649622802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 51649622802 in words is "fifty-one billion, six hundred forty-nine million, six hundred twenty-two thousand, eight hundred two".