53665408513 has 12 divisors (see below), whose sum is σ = 56121503620. Its totient is φ = 51312577536.

The previous prime is 53665408493. The next prime is 53665408547. The reversal of 53665408513 is 31580456635.

It can be written as a sum of positive squares in 2 ways, for example, as 24059732544 + 29605675969 = 155112^2 + 172063^2 .

It is a de Polignac number, because none of the positive numbers 2^k-53665408513 is a prime.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53665408213) by changing a digit.

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, 1480753 + ... + 1516561.

Almost surely, 2^53665408513 is an apocalyptic number.

It is an amenable number.

53665408513 is a deficient number, since it is larger than the sum of its proper divisors (2456095107).

53665408513 is a wasteful number, since it uses less digits than its factorization.

53665408513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38688 (or 38665 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 53665408513 in words is "fifty-three billion, six hundred sixty-five million, four hundred eight thousand, five hundred thirteen".