220438215153866 has 4 divisors (see below), whose sum is σ = 330657322730802. Its totient is φ = 110219107576932.

The previous prime is 220438215153847. The next prime is 220438215153889. The reversal of 220438215153866 is 668351512834022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 183935411673841 + 36502803480025 = 13562279^2 + 6041755^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55109553788465 + ... + 55109553788468.

Almost surely, 2^{220438215153866} is an apocalyptic number.

220438215153866 is a deficient number, since it is larger than the sum of its proper divisors (110219107576936).

220438215153866 is a wasteful number, since it uses less digits than its factorization.

220438215153866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110219107576935.

The product of its (nonzero) digits is 16588800, while the sum is 56.

Adding to 220438215153866 its reverse (668351512834022), we get a palindrome (888789727987888).

The spelling of 220438215153866 in words is "two hundred twenty trillion, four hundred thirty-eight billion, two hundred fifteen million, one hundred fifty-three thousand, eight hundred sixty-six".