6661763545 has 8 divisors (see below), whose sum is σ = 8043160896. Its totient is φ = 5296714416.

The previous prime is 6661763533. The next prime is 6661763551. The reversal of 6661763545 is 5453671666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6661763545 - 2⁷ = 6661763417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4086157 + ... + 4087786.

It is an arithmetic number, because the mean of its divisors is an integer number (1005395112).

Almost surely, 2^6661763545 is an apocalyptic number.

It is an amenable number.

6661763545 is a deficient number, since it is larger than the sum of its proper divisors (1381397351).

6661763545 is a wasteful number, since it uses less digits than its factorization.

6661763545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8174111.

The product of its digits is 2721600, while the sum is 49.

The square root of 6661763545 is about 81619.6272044905. The cubic root of 6661763545 is about 1881.6105431862.

The spelling of 6661763545 in words is "six billion, six hundred sixty-one million, seven hundred sixty-three thousand, five hundred forty-five".