654643615 has 4 divisors (see below), whose sum is σ = 785572344. Its totient is φ = 523714888.

The previous prime is 654643603. The next prime is 654643621. The reversal of 654643615 is 516346456.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 654643615 - 2⁹ = 654643103 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 3 ways as a sum of consecutive naturals, for example, 65464357 + ... + 65464366.

It is an arithmetic number, because the mean of its divisors is an integer number (196393086).

Almost surely, 2^654643615 is an apocalyptic number.

654643615 is a deficient number, since it is larger than the sum of its proper divisors (130928729).

654643615 is a wasteful number, since it uses less digits than its factorization.

654643615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130928728.

The product of its digits is 259200, while the sum is 40.

The square root of 654643615 is about 25586.0042796838. The cubic root of 654643615 is about 868.2970232086.

The spelling of 654643615 in words is "six hundred fifty-four million, six hundred forty-three thousand, six hundred fifteen".