220155208849 has 3 divisors (see below), whose sum is σ = 220155678057. Its totient is φ = 220154739642.

The previous prime is 220155208837. The next prime is 220155208873. The reversal of 220155208849 is 948802551022.

The square root of 220155208849 is 469207.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-220155208849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220155208799 and 220155208808.

It is not an unprimeable number, because it can be changed into a prime (220155208349) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 234604 + ... + 703810.

It is an arithmetic number, because the mean of its divisors is an integer number (73385226019).

Almost surely, 2^220155208849 is an apocalyptic number.

220155208849 is the 469207-th square number.

220155208849 is the 234604-th centered octagonal number.

It is an amenable number.

220155208849 is a deficient number, since it is larger than the sum of its proper divisors (469208).

220155208849 is an frugal number, since it uses more digits than its factorization.

220155208849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938414 (or 469207 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 46.

The spelling of 220155208849 in words is "two hundred twenty billion, one hundred fifty-five million, two hundred eight thousand, eight hundred forty-nine".