6661625047 has 16 divisors (see below), whose sum is σ = 8307189504. Its totient is φ = 5189760000.

The previous prime is 6661625039. The next prime is 6661625051. The reversal of 6661625047 is 7405261666.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6661625047 - 2³ = 6661625039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6661624994 and 6661625012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661625947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 689047 + ... + 698647.

It is an arithmetic number, because the mean of its divisors is an integer number (519199344).

Almost surely, 2^6661625047 is an apocalyptic number.

6661625047 is a deficient number, since it is larger than the sum of its proper divisors (1645564457).

6661625047 is a wasteful number, since it uses less digits than its factorization.

6661625047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18630.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 6661625047 is about 81618.7787644486. The cubic root of 6661625047 is about 1881.5975035408.

The spelling of 6661625047 in words is "six billion, six hundred sixty-one million, six hundred twenty-five thousand, forty-seven".