218306253152645 has 16 divisors (see below), whose sum is σ = 299393785329408. Its totient is φ = 149694540230400.

The previous prime is 218306253152599. The next prime is 218306253152657. The reversal of 218306253152645 is 546251352603812.

It is not a de Polignac number, because 218306253152645 - 2⁴⁰ = 217206741524869 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19974689 + ... + 28906758.

It is an arithmetic number, because the mean of its divisors is an integer number (18712111583088).

Almost surely, 2^{218306253152645} is an apocalyptic number.

It is an amenable number.

218306253152645 is a deficient number, since it is larger than the sum of its proper divisors (81087532176763).

218306253152645 is a wasteful number, since it uses less digits than its factorization.

218306253152645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49009060.

The product of its (nonzero) digits is 10368000, while the sum is 53.

The spelling of 218306253152645 in words is "two hundred eighteen trillion, three hundred six billion, two hundred fifty-three million, one hundred fifty-two thousand, six hundred forty-five".