1964591656 has 16 divisors (see below), whose sum is σ = 3684129300. Its totient is φ = 982157184.

The previous prime is 1964591641. The next prime is 1964591719. The reversal of 1964591656 is 6561954691.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1613628900 + 350962756 = 40170^2 + 18734^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67066 + ... + 91798.

Almost surely, 2^1964591656 is an apocalyptic number.

It is an amenable number.

1964591656 is a deficient number, since it is larger than the sum of its proper divisors (1719537644).

1964591656 is a wasteful number, since it uses less digits than its factorization.

1964591656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34668 (or 34664 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 52.

The square root of 1964591656 is about 44323.7143750386. The cubic root of 1964591656 is about 1252.4414483062.

The spelling of 1964591656 in words is "one billion, nine hundred sixty-four million, five hundred ninety-one thousand, six hundred fifty-six".