61518353855613 has 96 divisors (see below), whose sum is σ = 89909158090752. Its totient is φ = 37385579212800.

The previous prime is 61518353855603. The next prime is 61518353855659. The reversal of 61518353855613 is 31655835381516.

It is not a de Polignac number, because 61518353855613 - 2¹³ = 61518353847421 is a prime.

It is a super-2 number, since 2×61518353855613² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61518353855603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7584554428 + ... + 7584562538.

It is an arithmetic number, because the mean of its divisors is an integer number (936553730112).

Almost surely, 2^{61518353855613} is an apocalyptic number.

It is an amenable number.

61518353855613 is a deficient number, since it is larger than the sum of its proper divisors (28390804235139).

61518353855613 is a wasteful number, since it uses less digits than its factorization.

61518353855613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9875 (or 9858 counting only the distinct ones).

The product of its digits is 38880000, while the sum is 60.

The spelling of 61518353855613 in words is "sixty-one trillion, five hundred eighteen billion, three hundred fifty-three million, eight hundred fifty-five thousand, six hundred thirteen".