65221506406 has 64 divisors (see below), whose sum is σ = 114350616576. Its totient is φ = 27325188000.

The previous prime is 65221506377. The next prime is 65221506439. The reversal of 65221506406 is 60460512256.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58077361 + ... + 58078483.

It is an arithmetic number, because the mean of its divisors is an integer number (1786728384).

Almost surely, 2^65221506406 is an apocalyptic number.

65221506406 is a deficient number, since it is larger than the sum of its proper divisors (49129110170).

65221506406 is a wasteful number, since it uses less digits than its factorization.

65221506406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 65221506406 in words is "sixty-five billion, two hundred twenty-one million, five hundred six thousand, four hundred six".