646451553073 has 2 divisors, whose sum is σ = 646451553074. Its totient is φ = 646451553072.

The previous prime is 646451553001. The next prime is 646451553109. The reversal of 646451553073 is 370355154646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616589293824 + 29862259249 = 785232^2 + 172807^2 .

It is a cyclic number.

It is not a de Polignac number, because 646451553073 - 2¹³ = 646451544881 is a prime.

It is a super-2 number, since 2×646451553073² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646451553673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323225776536 + 323225776537.

It is an arithmetic number, because the mean of its divisors is an integer number (323225776537).

Almost surely, 2^646451553073 is an apocalyptic number.

It is an amenable number.

646451553073 is a deficient number, since it is larger than the sum of its proper divisors (1).

646451553073 is an equidigital number, since it uses as much as digits as its factorization.

646451553073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536000, while the sum is 49.

The spelling of 646451553073 in words is "six hundred forty-six billion, four hundred fifty-one million, five hundred fifty-three thousand, seventy-three".