218151425261 has 24 divisors (see below), whose sum is σ = 274114404480. Its totient is φ = 169942877280.

The previous prime is 218151425257. The next prime is 218151425417. The reversal of 218151425261 is 162524151812.

It is not a de Polignac number, because 218151425261 - 2² = 218151425257 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218151424261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3346400 + ... + 3410966.

It is an arithmetic number, because the mean of its divisors is an integer number (11421433520).

Almost surely, 2^218151425261 is an apocalyptic number.

It is an amenable number.

218151425261 is a deficient number, since it is larger than the sum of its proper divisors (55962979219).

218151425261 is a wasteful number, since it uses less digits than its factorization.

218151425261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68585 (or 68574 counting only the distinct ones).

The product of its digits is 38400, while the sum is 38.

The spelling of 218151425261 in words is "two hundred eighteen billion, one hundred fifty-one million, four hundred twenty-five thousand, two hundred sixty-one".