1964664646 has 16 divisors (see below), whose sum is σ = 3514431744. Its totient is φ = 805390344.

The previous prime is 1964664641. The next prime is 1964664679. The reversal of 1964664646 is 6464664691.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1964664593 and 1964664602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1964664641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3050400 + ... + 3051043.

It is an arithmetic number, because the mean of its divisors is an integer number (219651984).

Almost surely, 2^1964664646 is an apocalyptic number.

1964664646 is a deficient number, since it is larger than the sum of its proper divisors (1549767098).

1964664646 is a wasteful number, since it uses less digits than its factorization.

1964664646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6101475.

The product of its digits is 4478976, while the sum is 52.

The square root of 1964664646 is about 44324.5377415264. The cubic root of 1964664646 is about 1252.4569586658.

The spelling of 1964664646 in words is "one billion, nine hundred sixty-four million, six hundred sixty-four thousand, six hundred forty-six".