65221506466 has 12 divisors (see below), whose sum is σ = 100547841618. Its totient is φ = 31729380192.

The previous prime is 65221506439. The next prime is 65221506523. The reversal of 65221506466 is 66460512256.

It is a happy number.

65221506466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 65014290441 + 207216025 = 254979^2 + 14395^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11907691 + ... + 11913166.

Almost surely, 2^65221506466 is an apocalyptic number.

65221506466 is a deficient number, since it is larger than the sum of its proper divisors (35326335152).

65221506466 is a wasteful number, since it uses less digits than its factorization.

65221506466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23820933 (or 23820896 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 65221506466 in words is "sixty-five billion, two hundred twenty-one million, five hundred six thousand, four hundred sixty-six".