646422651481 has 2 divisors, whose sum is σ = 646422651482. Its totient is φ = 646422651480.

The previous prime is 646422651473. The next prime is 646422651499. The reversal of 646422651481 is 184156224646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 434523545856 + 211899105625 = 659184^2 + 460325^2 .

It is a cyclic number.

It is not a de Polignac number, because 646422651481 - 2³ = 646422651473 is a prime.

It is a super-2 number, since 2×646422651481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646422651401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323211325740 + 323211325741.

It is an arithmetic number, because the mean of its divisors is an integer number (323211325741).

Almost surely, 2^646422651481 is an apocalyptic number.

It is an amenable number.

646422651481 is a deficient number, since it is larger than the sum of its proper divisors (1).

646422651481 is an equidigital number, since it uses as much as digits as its factorization.

646422651481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2211840, while the sum is 49.

The spelling of 646422651481 in words is "six hundred forty-six billion, four hundred twenty-two million, six hundred fifty-one thousand, four hundred eighty-one".