220991965 has 8 divisors (see below), whose sum is σ = 265351680. Its totient is φ = 176686032.

The previous prime is 220991957. The next prime is 220991971. The reversal of 220991965 is 569199022.

It is a happy number.

220991965 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 220991965 - 2³ = 220991957 is a prime.

It is a super-2 number, since 2×220991965² = 97674897189122450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3769 + ... + 21358.

It is an arithmetic number, because the mean of its divisors is an integer number (33168960).

Almost surely, 2^220991965 is an apocalyptic number.

It is an amenable number.

220991965 is a deficient number, since it is larger than the sum of its proper divisors (44359715).

220991965 is a wasteful number, since it uses less digits than its factorization.

220991965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26891.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 220991965 is about 14865.7984985671. The cubic root of 220991965 is about 604.5870323395.

The spelling of 220991965 in words is "two hundred twenty million, nine hundred ninety-one thousand, nine hundred sixty-five".