65221553 has 2 divisors, whose sum is σ = 65221554. Its totient is φ = 65221552.

The previous prime is 65221517. The next prime is 65221579. The reversal of 65221553 is 35512256.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49674304 + 15547249 = 7048^2 + 3943^2 .

It is a cyclic number.

It is not a de Polignac number, because 65221553 - 2⁸ = 65221297 is a prime.

It is not a weakly prime, because it can be changed into another prime (65221253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32610776 + 32610777.

It is an arithmetic number, because the mean of its divisors is an integer number (32610777).

Almost surely, 2^65221553 is an apocalyptic number.

It is an amenable number.

65221553 is a deficient number, since it is larger than the sum of its proper divisors (1).

65221553 is an equidigital number, since it uses as much as digits as its factorization.

65221553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 29.

The square root of 65221553 is about 8075.9861936484. The cubic root of 65221553 is about 402.5288803011.

The spelling of 65221553 in words is "sixty-five million, two hundred twenty-one thousand, five hundred fifty-three".