656198644 has 6 divisors (see below), whose sum is σ = 1148347634. Its totient is φ = 328099320.

The previous prime is 656198597. The next prime is 656198651. The reversal of 656198644 is 446891656.

It can be written as a sum of positive squares in only one way, i.e., 424854544 + 231344100 = 20612^2 + 15210^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 82024827 + ... + 82024834.

Almost surely, 2^656198644 is an apocalyptic number.

It is an amenable number.

656198644 is a deficient number, since it is larger than the sum of its proper divisors (492148990).

656198644 is a wasteful number, since it uses less digits than its factorization.

656198644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164049665 (or 164049663 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

The square root of 656198644 is about 25616.3745288048. The cubic root of 656198644 is about 868.9839920811.

The spelling of 656198644 in words is "six hundred fifty-six million, one hundred ninety-eight thousand, six hundred forty-four".