51720001065 has 32 divisors (see below), whose sum is σ = 91961308800. Its totient is φ = 27579608640.

The previous prime is 51720001043. The next prime is 51720001103. The reversal of 51720001065 is 56010002715.

It is not a de Polignac number, because 51720001065 - 2¹⁰ = 51720000041 is a prime.

It is a super-2 number, since 2×51720001065² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 932770 + ... + 986660.

It is an arithmetic number, because the mean of its divisors is an integer number (2873790900).

Almost surely, 2^51720001065 is an apocalyptic number.

It is an amenable number.

51720001065 is a deficient number, since it is larger than the sum of its proper divisors (40241307735).

51720001065 is a wasteful number, since it uses less digits than its factorization.

51720001065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61014 (or 61008 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The spelling of 51720001065 in words is "fifty-one billion, seven hundred twenty million, one thousand, sixty-five".