656143538 has 8 divisors (see below), whose sum is σ = 984330732. Its totient is φ = 328033296.

The previous prime is 656143513. The next prime is 656143559. The reversal of 656143538 is 835341656.

It can be written as a sum of positive squares in 2 ways, for example, as 650913169 + 5230369 = 25513^2 + 2287^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 656143495 and 656143504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12656 + ... + 38372.

Almost surely, 2^656143538 is an apocalyptic number.

656143538 is a deficient number, since it is larger than the sum of its proper divisors (328187194).

656143538 is a wasteful number, since it uses less digits than its factorization.

656143538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38476.

The product of its digits is 259200, while the sum is 41.

The square root of 656143538 is about 25615.2989051465. The cubic root of 656143538 is about 868.9596663312.

The spelling of 656143538 in words is "six hundred fifty-six million, one hundred forty-three thousand, five hundred thirty-eight".