646220331423 has 10 divisors (see below), whose sum is σ = 965341482864. Its totient is φ = 430813554228.

The previous prime is 646220331409. The next prime is 646220331457. The reversal of 646220331423 is 324133022646.

646220331423 is a `hidden beast` number, since 6 + 4 + 6 + 220 + 3 + 3 + 1 + 423 = 666.

It is not a de Polignac number, because 646220331423 - 2⁶ = 646220331359 is a prime.

It is a super-2 number, since 2×646220331423² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646220331023) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3989014311 + ... + 3989014472.

Almost surely, 2^646220331423 is an apocalyptic number.

646220331423 is a deficient number, since it is larger than the sum of its proper divisors (319121151441).

646220331423 is an equidigital number, since it uses as much as digits as its factorization.

646220331423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7978028795 (or 7978028786 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 36.

The spelling of 646220331423 in words is "six hundred forty-six billion, two hundred twenty million, three hundred thirty-one thousand, four hundred twenty-three".