6443626401 has 6 divisors (see below), whose sum is σ = 9307460370. Its totient is φ = 4295750928.

The previous prime is 6443626391. The next prime is 6443626429. The reversal of 6443626401 is 1046263446.

6443626401 is a `hidden beast` number, since 6 + 4 + 4 + 3 + 6 + 2 + 640 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4048013376 + 2395613025 = 63624^2 + 48945^2 .

It is not a de Polignac number, because 6443626401 - 2⁵ = 6443626369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6443626471) 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, 357979236 + ... + 357979253.

It is an arithmetic number, because the mean of its divisors is an integer number (1551243395).

Almost surely, 2^6443626401 is an apocalyptic number.

It is an amenable number.

6443626401 is a deficient number, since it is larger than the sum of its proper divisors (2863833969).

6443626401 is a wasteful number, since it uses less digits than its factorization.

6443626401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715958495 (or 715958492 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 6443626401 is about 80272.2019194690. The cubic root of 6443626401 is about 1860.8446467288.

Adding to 6443626401 its reverse (1046263446), we get a palindrome (7489889847).

The spelling of 6443626401 in words is "six billion, four hundred forty-three million, six hundred twenty-six thousand, four hundred one".