646447235741 has 2 divisors, whose sum is σ = 646447235742. Its totient is φ = 646447235740.

The previous prime is 646447235717. The next prime is 646447235773. The reversal of 646447235741 is 147532744646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642450340900 + 3996894841 = 801530^2 + 63221^2 .

It is a cyclic number.

It is not a de Polignac number, because 646447235741 - 2¹⁸ = 646446973597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646447265741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323223617870 + 323223617871.

It is an arithmetic number, because the mean of its divisors is an integer number (323223617871).

Almost surely, 2^646447235741 is an apocalyptic number.

It is an amenable number.

646447235741 is a deficient number, since it is larger than the sum of its proper divisors (1).

646447235741 is an equidigital number, since it uses as much as digits as its factorization.

646447235741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13547520, while the sum is 53.

The spelling of 646447235741 in words is "six hundred forty-six billion, four hundred forty-seven million, two hundred thirty-five thousand, seven hundred forty-one".