53663918321 has 16 divisors (see below), whose sum is σ = 58241106000. Its totient is φ = 49151244288.

The previous prime is 53663918311. The next prime is 53663918381. The reversal of 53663918321 is 12381936635.

It can be written as a sum of positive squares in 8 ways, for example, as 1023040225 + 52640878096 = 31985^2 + 229436^2 .

It is a cyclic number.

It is not a de Polignac number, because 53663918321 - 2¹⁰ = 53663917297 is a prime.

It is a super-2 number, since 2×53663918321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53663918311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4640855 + ... + 4652403.

It is an arithmetic number, because the mean of its divisors is an integer number (3640069125).

Almost surely, 2^53663918321 is an apocalyptic number.

It is an amenable number.

53663918321 is a deficient number, since it is larger than the sum of its proper divisors (4577187679).

53663918321 is a wasteful number, since it uses less digits than its factorization.

53663918321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14308.

The product of its digits is 699840, while the sum is 47.

The spelling of 53663918321 in words is "fifty-three billion, six hundred sixty-three million, nine hundred eighteen thousand, three hundred twenty-one".