65650554421 has 2 divisors, whose sum is σ = 65650554422. Its totient is φ = 65650554420.

The previous prime is 65650554391. The next prime is 65650554439. The reversal of 65650554421 is 12445505656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61548151921 + 4102402500 = 248089^2 + 64050^2 .

It is a cyclic number.

It is not a de Polignac number, because 65650554421 - 2³¹ = 63503070773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65650854421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32825277210 + 32825277211.

It is an arithmetic number, because the mean of its divisors is an integer number (32825277211).

Almost surely, 2^65650554421 is an apocalyptic number.

It is an amenable number.

65650554421 is a deficient number, since it is larger than the sum of its proper divisors (1).

65650554421 is an equidigital number, since it uses as much as digits as its factorization.

65650554421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720000, while the sum is 43.

The spelling of 65650554421 in words is "sixty-five billion, six hundred fifty million, five hundred fifty-four thousand, four hundred twenty-one".