6535406403 has 16 divisors (see below), whose sum is σ = 9684854400. Its totient is φ = 4355690760.

The previous prime is 6535406401. The next prime is 6535406467. The reversal of 6535406403 is 3046045356.

6535406403 is a `hidden beast` number, since 6 + 5 + 3 + 5 + 4 + 0 + 640 + 3 = 666.

It is not a de Polignac number, because 6535406403 - 2¹ = 6535406401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6535406401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66868 + ... + 132446.

It is an arithmetic number, because the mean of its divisors is an integer number (605303400).

Almost surely, 2^6535406403 is an apocalyptic number.

6535406403 is a deficient number, since it is larger than the sum of its proper divisors (3149447997).

6535406403 is a wasteful number, since it uses less digits than its factorization.

6535406403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69279 (or 69273 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The square root of 6535406403 is about 80841.8604622630. The cubic root of 6535406403 is about 1869.6380287309.

The spelling of 6535406403 in words is "six billion, five hundred thirty-five million, four hundred six thousand, four hundred three".