1641776964 has 12 divisors (see below), whose sum is σ = 3830812944. Its totient is φ = 547258984.

The previous prime is 1641776953. The next prime is 1641776993. The reversal of 1641776964 is 4696771461.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68407362 + ... + 68407385.

It is an arithmetic number, because the mean of its divisors is an integer number (319234412).

Almost surely, 2^1641776964 is an apocalyptic number.

It is an amenable number.

1641776964 is an abundant number, since it is smaller than the sum of its proper divisors (2189035980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1641776964 is a wasteful number, since it uses less digits than its factorization.

1641776964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136814754 (or 136814752 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 51.

The square root of 1641776964 is about 40518.8470220958. The cubic root of 1641776964 is about 1179.6994743631.

The spelling of 1641776964 in words is "one billion, six hundred forty-one million, seven hundred seventy-six thousand, nine hundred sixty-four".