6438154615 has 8 divisors (see below), whose sum is σ = 7768470528. Its totient is φ = 5122067040.

The previous prime is 6438154607. The next prime is 6438154669. The reversal of 6438154615 is 5164518346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6438154615 - 2³ = 6438154607 is a prime.

It is a Duffinian number.

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, 3556087 + ... + 3557896.

It is an arithmetic number, because the mean of its divisors is an integer number (971058816).

Almost surely, 2^6438154615 is an apocalyptic number.

6438154615 is a deficient number, since it is larger than the sum of its proper divisors (1330315913).

6438154615 is a wasteful number, since it uses less digits than its factorization.

6438154615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7114169.

The product of its digits is 345600, while the sum is 43.

The square root of 6438154615 is about 80238.1119855147. Note that the first 3 decimals coincide. The cubic root of 6438154615 is about 1860.3177680964.

The spelling of 6438154615 in words is "six billion, four hundred thirty-eight million, one hundred fifty-four thousand, six hundred fifteen".