65644146621 has 6 divisors (see below), whose sum is σ = 94819322910. Its totient is φ = 43762764408.

The previous prime is 65644146599. The next prime is 65644146671. The reversal of 65644146621 is 12664144656.

65644146621 is a `hidden beast` number, since 6 + 5 + 6 + 4 + 4 + 14 + 6 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 44021914596 + 21622232025 = 209814^2 + 147045^2 .

It is not a de Polignac number, because 65644146621 - 2⁷ = 65644146493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65644146671) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3646897026 + ... + 3646897043.

It is an arithmetic number, because the mean of its divisors is an integer number (15803220485).

Almost surely, 2^65644146621 is an apocalyptic number.

It is an amenable number.

65644146621 is a deficient number, since it is larger than the sum of its proper divisors (29175176289).

65644146621 is a wasteful number, since it uses less digits than its factorization.

65644146621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7293794075 (or 7293794072 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The spelling of 65644146621 in words is "sixty-five billion, six hundred forty-four million, one hundred forty-six thousand, six hundred twenty-one".