51566601650 has 24 divisors (see below), whose sum is σ = 96902691060. Its totient is φ = 20413992960.

The previous prime is 51566601649. The next prime is 51566601689. The reversal of 51566601650 is 5610666515.

It can be written as a sum of positive squares in 6 ways, for example, as 31535011561 + 20031590089 = 177581^2 + 141533^2 .

It is a super-2 number, since 2×51566601650² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51566601598 and 51566601607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5311295 + ... + 5320994.

Almost surely, 2^51566601650 is an apocalyptic number.

51566601650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51566601650 is a deficient number, since it is larger than the sum of its proper divisors (45336089410).

51566601650 is a wasteful number, since it uses less digits than its factorization.

51566601650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10632398 (or 10632393 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 51566601650 in words is "fifty-one billion, five hundred sixty-six million, six hundred one thousand, six hundred fifty".