51489561601 has 16 divisors (see below), whose sum is σ = 53209878480. Its totient is φ = 49787136000.

The previous prime is 51489561559. The next prime is 51489561661. The reversal of 51489561601 is 10616598415.

It can be written as a sum of positive squares in 8 ways, for example, as 8217241201 + 43272320400 = 90649^2 + 208020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51489561601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51489561661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7351101 + ... + 7358101.

It is an arithmetic number, because the mean of its divisors is an integer number (3325617405).

Almost surely, 2^51489561601 is an apocalyptic number.

It is an amenable number.

51489561601 is a deficient number, since it is larger than the sum of its proper divisors (1720316879).

51489561601 is a wasteful number, since it uses less digits than its factorization.

51489561601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8244.

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 51489561601 in words is "fifty-one billion, four hundred eighty-nine million, five hundred sixty-one thousand, six hundred one".