218991897225 has 144 divisors (see below), whose sum is σ = 410130972160. Its totient is φ = 111601152000.

The previous prime is 218991897211. The next prime is 218991897227. The reversal of 218991897225 is 522798199812.

It is not a de Polignac number, because 218991897225 - 2⁸ = 218991896969 is a prime.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

Its product of digits (13063680) is a multiple of the sum of its prime factors (2240).

It is not an unprimeable number, because it can be changed into a prime (218991897227) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 112245000 + ... + 112246950.

Almost surely, 2^218991897225 is an apocalyptic number.

218991897225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

218991897225 is a deficient number, since it is larger than the sum of its proper divisors (191139074935).

218991897225 is a wasteful number, since it uses less digits than its factorization.

218991897225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240 (or 2232 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 63.

The spelling of 218991897225 in words is "two hundred eighteen billion, nine hundred ninety-one million, eight hundred ninety-seven thousand, two hundred twenty-five".