65221766 has 4 divisors (see below), whose sum is σ = 97832652. Its totient is φ = 32610882.

The previous prime is 65221697. The next prime is 65221769. The reversal of 65221766 is 66712256.

65221766 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.

It is a super-3 number, since 3×65221766³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65221769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16305440 + ... + 16305443.

It is an arithmetic number, because the mean of its divisors is an integer number (24458163).

Almost surely, 2^65221766 is an apocalyptic number.

65221766 is a deficient number, since it is larger than the sum of its proper divisors (32610886).

65221766 is a wasteful number, since it uses less digits than its factorization.

65221766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32610885.

The product of its digits is 30240, while the sum is 35.

The square root of 65221766 is about 8075.9993808816. Note that the first 3 decimals coincide. The cubic root of 65221766 is about 402.5293184924.

The spelling of 65221766 in words is "sixty-five million, two hundred twenty-one thousand, seven hundred sixty-six".