6644969762 has 6 divisors (see below), whose sum is σ = 9967627569. Its totient is φ = 3322427240.

The previous prime is 6644969761. The next prime is 6644969789. The reversal of 6644969762 is 2679694466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4060365841 + 2584603921 = 63721^2 + 50839^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=57641.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6644969761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 86462 + ... + 144102.

Almost surely, 2^6644969762 is an apocalyptic number.

6644969762 is a deficient number, since it is larger than the sum of its proper divisors (3322657807).

6644969762 is an frugal number, since it uses more digits than its factorization.

6644969762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115284 (or 57643 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 59.

The square root of 6644969762 is about 81516.6839487476. The cubic root of 6644969762 is about 1880.0280818576.

The spelling of 6644969762 in words is "six billion, six hundred forty-four million, nine hundred sixty-nine thousand, seven hundred sixty-two".