6656478436 has 6 divisors (see below), whose sum is σ = 11648837270. Its totient is φ = 3328239216.

The previous prime is 6656478359. The next prime is 6656478443. The reversal of 6656478436 is 6348746566.

It can be written as a sum of positive squares in only one way, i.e., 6489913600 + 166564836 = 80560^2 + 12906^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832059801 + ... + 832059808.

Almost surely, 2^6656478436 is an apocalyptic number.

It is an amenable number.

6656478436 is a deficient number, since it is larger than the sum of its proper divisors (4992358834).

6656478436 is a wasteful number, since it uses less digits than its factorization.

6656478436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664119613 (or 1664119611 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 55.

The square root of 6656478436 is about 81587.2443216463. The cubic root of 6656478436 is about 1881.1128197363.

The spelling of 6656478436 in words is "six billion, six hundred fifty-six million, four hundred seventy-eight thousand, four hundred thirty-six".