220015661 has 8 divisors (see below), whose sum is σ = 223979040. Its totient is φ = 216060208.

The previous prime is 220015657. The next prime is 220015693. The reversal of 220015661 is 166510022.

220015661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 220015661 - 2² = 220015657 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 (220015651) 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, 97235 + ... + 99471.

It is an arithmetic number, because the mean of its divisors is an integer number (27997380).

Almost surely, 2^220015661 is an apocalyptic number.

It is an amenable number.

220015661 is a deficient number, since it is larger than the sum of its proper divisors (3963379).

220015661 is a wasteful number, since it uses less digits than its factorization.

220015661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 220015661 is about 14832.9248969986. The cubic root of 220015661 is about 603.6953979600.

Adding to 220015661 its reverse (166510022), we get a palindrome (386525683).

The spelling of 220015661 in words is "two hundred twenty million, fifteen thousand, six hundred sixty-one".