218351129854 has 48 divisors (see below), whose sum is σ = 397599980400. Its totient is φ = 88660396800.

The previous prime is 218351129839. The next prime is 218351129869. The reversal of 218351129854 is 458921153812.

It is an interprime number because it is at equal distance from previous prime (218351129839) and next prime (218351129869).

It is a super-2 number, since 2×218351129854² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 218351129798 and 218351129807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122379 + ... + 672070.

It is an arithmetic number, because the mean of its divisors is an integer number (8283332925).

Almost surely, 2^218351129854 is an apocalyptic number.

218351129854 is a deficient number, since it is larger than the sum of its proper divisors (179248850546).

218351129854 is a wasteful number, since it uses less digits than its factorization.

218351129854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794537 (or 794506 counting only the distinct ones).

The product of its digits is 691200, while the sum is 49.

The spelling of 218351129854 in words is "two hundred eighteen billion, three hundred fifty-one million, one hundred twenty-nine thousand, eight hundred fifty-four".