6506636438 has 16 divisors (see below), whose sum is σ = 10212809856. Its totient is φ = 3105241920.

The previous prime is 6506636429. The next prime is 6506636441. The reversal of 6506636438 is 8346366056.

It is a junction number, because it is equal to n+sod(n) for n = 6506636392 and 6506636401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714281 + ... + 723332.

It is an arithmetic number, because the mean of its divisors is an integer number (638300616).

Almost surely, 2^6506636438 is an apocalyptic number.

6506636438 is a deficient number, since it is larger than the sum of its proper divisors (3706173418).

6506636438 is a wasteful number, since it uses less digits than its factorization.

6506636438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437719.

The product of its (nonzero) digits is 1866240, while the sum is 47.

The square root of 6506636438 is about 80663.7244243036. The cubic root of 6506636438 is about 1866.8905054209.

The spelling of 6506636438 in words is "six billion, five hundred six million, six hundred thirty-six thousand, four hundred thirty-eight".