51665058493 has 12 divisors (see below), whose sum is σ = 54565879228. Its totient is φ = 48909231360.

The previous prime is 51665058481. The next prime is 51665058499. The reversal of 51665058493 is 39485056615.

It can be written as a sum of positive squares in 2 ways, for example, as 10755141849 + 40909916644 = 103707^2 + 202262^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51665058493 is a prime.

It is a super-2 number, since 2×51665058493² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51665058493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51665058499) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 452118 + ... + 554743.

Almost surely, 2^51665058493 is an apocalyptic number.

It is an amenable number.

51665058493 is a deficient number, since it is larger than the sum of its proper divisors (2900820735).

51665058493 is a wasteful number, since it uses less digits than its factorization.

51665058493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007004 (or 1006981 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 51665058493 in words is "fifty-one billion, six hundred sixty-five million, fifty-eight thousand, four hundred ninety-three".