513540135656 has 8 divisors (see below), whose sum is σ = 962887754370. Its totient is φ = 256770067824.

The previous prime is 513540135623. The next prime is 513540135659. The reversal of 513540135656 is 656531045315.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 474260859556 + 39279276100 = 688666^2 + 198190^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (513540135659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32096258471 + ... + 32096258486.

Almost surely, 2^513540135656 is an apocalyptic number.

It is an amenable number.

513540135656 is a deficient number, since it is larger than the sum of its proper divisors (449347618714).

513540135656 is a wasteful number, since it uses less digits than its factorization.

513540135656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64192516963 (or 64192516959 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 44.

The spelling of 513540135656 in words is "five hundred thirteen billion, five hundred forty million, one hundred thirty-five thousand, six hundred fifty-six".