272220661 has 4 divisors (see below), whose sum is σ = 275500512. Its totient is φ = 268940812.

The previous prime is 272220647. The next prime is 272220673. The reversal of 272220661 is 166022272.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 272220661 - 2¹¹ = 272218613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (272220601) 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, 1639801 + ... + 1639966.

It is an arithmetic number, because the mean of its divisors is an integer number (68875128).

Almost surely, 2^272220661 is an apocalyptic number.

It is an amenable number.

272220661 is a deficient number, since it is larger than the sum of its proper divisors (3279851).

272220661 is an equidigital number, since it uses as much as digits as its factorization.

272220661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279850.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 272220661 is about 16499.1109154403. The cubic root of 272220661 is about 648.0975226959.

The spelling of 272220661 in words is "two hundred seventy-two million, two hundred twenty thousand, six hundred sixty-one".