220725681 has 8 divisors (see below), whose sum is σ = 321055584. Its totient is φ = 133773120.

The previous prime is 220725599. The next prime is 220725691. The reversal of 220725681 is 186527022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 220725681 - 2⁷ = 220725553 is a prime.

It is a super-2 number, since 2×220725681² = 97439652505827522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 6688657 = 220725681 / (2 + 2 + 0 + 7 + 2 + 5 + 6 + 8 + 1).

It is not an unprimeable number, because it can be changed into a prime (220725691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3344296 + ... + 3344361.

It is an arithmetic number, because the mean of its divisors is an integer number (40131948).

Almost surely, 2^220725681 is an apocalyptic number.

It is an amenable number.

220725681 is a deficient number, since it is larger than the sum of its proper divisors (100329903).

220725681 is a wasteful number, since it uses less digits than its factorization.

220725681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6688671.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 220725681 is about 14856.8395360521. The cubic root of 220725681 is about 604.3441026038.

The spelling of 220725681 in words is "two hundred twenty million, seven hundred twenty-five thousand, six hundred eighty-one".