656129798 has 4 divisors (see below), whose sum is σ = 984194700. Its totient is φ = 328064898.

The previous prime is 656129797. The next prime is 656129893. The reversal of 656129798 is 897921656.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656129797) by changing a digit.

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 as a sum of consecutive naturals, namely, 164032448 + ... + 164032451.

It is an arithmetic number, because the mean of its divisors is an integer number (246048675).

Almost surely, 2^656129798 is an apocalyptic number.

656129798 is a deficient number, since it is larger than the sum of its proper divisors (328064902).

656129798 is a wasteful number, since it uses less digits than its factorization.

656129798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328064901.

The product of its digits is 1632960, while the sum is 53.

The square root of 656129798 is about 25615.0307046468. The cubic root of 656129798 is about 868.9536007940.

The spelling of 656129798 in words is "six hundred fifty-six million, one hundred twenty-nine thousand, seven hundred ninety-eight".