65221506451 has 8 divisors (see below), whose sum is σ = 69086751984. Its totient is φ = 61359448320.

The previous prime is 65221506439. The next prime is 65221506523. The reversal of 65221506451 is 15460512256.

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 65221506451 - 2¹³ = 65221498259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65221506451.

It is not an unprimeable number, because it can be changed into a prime (65221506151) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 754650 + ... + 836623.

It is an arithmetic number, because the mean of its divisors is an integer number (8635843998).

Almost surely, 2^65221506451 is an apocalyptic number.

65221506451 is a deficient number, since it is larger than the sum of its proper divisors (3865245533).

65221506451 is a wasteful number, since it uses less digits than its factorization.

65221506451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593701.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 65221506451 in words is "sixty-five billion, two hundred twenty-one million, five hundred six thousand, four hundred fifty-one".