218388231465 has 16 divisors (see below), whose sum is σ = 351077199936. Its totient is φ = 115921713600.

The previous prime is 218388231437. The next prime is 218388231511. The reversal of 218388231465 is 564132883812.

It is not a de Polignac number, because 218388231465 - 2⁵ = 218388231433 is a prime.

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, 34497346 + ... + 34503675.

It is an arithmetic number, because the mean of its divisors is an integer number (21942324996).

Almost surely, 2^218388231465 is an apocalyptic number.

It is an amenable number.

218388231465 is a deficient number, since it is larger than the sum of its proper divisors (132688968471).

218388231465 is a wasteful number, since it uses less digits than its factorization.

218388231465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69001240.

The product of its digits is 2211840, while the sum is 51.

The spelling of 218388231465 in words is "two hundred eighteen billion, three hundred eighty-eight million, two hundred thirty-one thousand, four hundred sixty-five".