53578217218 has 4 divisors (see below), whose sum is σ = 80367325830. Its totient is φ = 26789108608.

The previous prime is 53578217201. The next prime is 53578217219. The reversal of 53578217218 is 81271287535.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81271287535 = 5 ⋅16254257507.

It can be written as a sum of positive squares in only one way, i.e., 53415067689 + 163149529 = 231117^2 + 12773^2 .

It is not an unprimeable number, because it can be changed into a prime (53578217219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13394554303 + ... + 13394554306.

Almost surely, 2^53578217218 is an apocalyptic number.

53578217218 is a deficient number, since it is larger than the sum of its proper divisors (26789108612).

53578217218 is a wasteful number, since it uses less digits than its factorization.

53578217218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26789108611.

The product of its digits is 940800, while the sum is 49.

The spelling of 53578217218 in words is "fifty-three billion, five hundred seventy-eight million, two hundred seventeen thousand, two hundred eighteen".