220252661 has 4 divisors (see below), whose sum is σ = 222727500. Its totient is φ = 217777824.

The previous prime is 220252633. The next prime is 220252667. The reversal of 220252661 is 166252022.

220252661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166252022 = 2 ⋅83126011.

It can be written as a sum of positive squares in 2 ways, for example, as 49140100 + 171112561 = 7010^2 + 13081^2 .

It is a cyclic number.

It is not a de Polignac number, because 220252661 - 2⁶ = 220252597 is a prime.

It is a super-2 number, since 2×220252661² = 97022469355161842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220252661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220252667) 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, 1237286 + ... + 1237463.

It is an arithmetic number, because the mean of its divisors is an integer number (55681875).

Almost surely, 2^220252661 is an apocalyptic number.

It is an amenable number.

220252661 is a deficient number, since it is larger than the sum of its proper divisors (2474839).

220252661 is an equidigital number, since it uses as much as digits as its factorization.

220252661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474838.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 220252661 is about 14840.9117307529. The cubic root of 220252661 is about 603.9120862718.

The spelling of 220252661 in words is "two hundred twenty million, two hundred fifty-two thousand, six hundred sixty-one".