218432273136901 has 4 divisors (see below), whose sum is σ = 218432307779404. Its totient is φ = 218432238494400.

The previous prime is 218432273136877. The next prime is 218432273136941. The reversal of 218432273136901 is 109631372234812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62138520074401 + 156293753062500 = 7882799^2 + 12501750^2 .

It is a cyclic number.

It is not a de Polignac number, because 218432273136901 - 2³¹ = 218430125653253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218432273136941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4888740 + ... + 21465421.

It is an arithmetic number, because the mean of its divisors is an integer number (54608076944851).

Almost surely, 2^{218432273136901} is an apocalyptic number.

It is an amenable number.

218432273136901 is a deficient number, since it is larger than the sum of its proper divisors (34642503).

218432273136901 is an equidigital number, since it uses as much as digits as its factorization.

218432273136901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34642502.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 218432273136901 in words is "two hundred eighteen trillion, four hundred thirty-two billion, two hundred seventy-three million, one hundred thirty-six thousand, nine hundred one".