65354221561 has 2 divisors, whose sum is σ = 65354221562. Its totient is φ = 65354221560.

The previous prime is 65354221547. The next prime is 65354221567. The reversal of 65354221561 is 16512245356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33819210000 + 31535011561 = 183900^2 + 177581^2 .

It is a cyclic number.

It is not a de Polignac number, because 65354221561 - 2³⁵ = 30994483193 is a prime.

It is not a weakly prime, because it can be changed into another prime (65354221567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32677110780 + 32677110781.

It is an arithmetic number, because the mean of its divisors is an integer number (32677110781).

Almost surely, 2^65354221561 is an apocalyptic number.

It is an amenable number.

65354221561 is a deficient number, since it is larger than the sum of its proper divisors (1).

65354221561 is an equidigital number, since it uses as much as digits as its factorization.

65354221561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216000, while the sum is 40.

The spelling of 65354221561 in words is "sixty-five billion, three hundred fifty-four million, two hundred twenty-one thousand, five hundred sixty-one".