220949945551 has 4 divisors (see below), whose sum is σ = 220997456104. Its totient is φ = 220902435000.

The previous prime is 220949945549. The next prime is 220949945563. The reversal of 220949945551 is 155549949022.

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

It is a cyclic number.

It is not a de Polignac number, because 220949945551 - 2¹ = 220949945549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220949945492 and 220949945501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220949925551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23748300 + ... + 23757601.

It is an arithmetic number, because the mean of its divisors is an integer number (55249364026).

Almost surely, 2^220949945551 is an apocalyptic number.

220949945551 is a deficient number, since it is larger than the sum of its proper divisors (47510553).

220949945551 is an equidigital number, since it uses as much as digits as its factorization.

220949945551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47510552.

The product of its (nonzero) digits is 5832000, while the sum is 55.

The spelling of 220949945551 in words is "two hundred twenty billion, nine hundred forty-nine million, nine hundred forty-five thousand, five hundred fifty-one".