51556601066 has 8 divisors (see below), whose sum is σ = 77346766020. Its totient is φ = 25774345728.

The previous prime is 51556601039. The next prime is 51556601069. The reversal of 51556601066 is 66010665515.

It can be written as a sum of positive squares in 2 ways, for example, as 40838347225 + 10718253841 = 202085^2 + 103529^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×51556601066² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51556601069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1961081 + ... + 1987196.

Almost surely, 2^51556601066 is an apocalyptic number.

51556601066 is a deficient number, since it is larger than the sum of its proper divisors (25790164954).

51556601066 is a wasteful number, since it uses less digits than its factorization.

51556601066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3954808.

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

The spelling of 51556601066 in words is "fifty-one billion, five hundred fifty-six million, six hundred one thousand, sixty-six".