661204747 has 8 divisors (see below), whose sum is σ = 757117152. Its totient is φ = 565656000.

The previous prime is 661204723. The next prime is 661204751. The reversal of 661204747 is 747402166.

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

It is a de Polignac number, because none of the positive numbers 2^k-661204747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661204757) 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, 87004 + ... + 94297.

It is an arithmetic number, because the mean of its divisors is an integer number (94639644).

Almost surely, 2^661204747 is an apocalyptic number.

661204747 is a deficient number, since it is larger than the sum of its proper divisors (95912405).

661204747 is a wasteful number, since it uses less digits than its factorization.

661204747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181829.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 661204747 is about 25713.9018237217. The cubic root of 661204747 is about 871.1882064712.

The spelling of 661204747 in words is "six hundred sixty-one million, two hundred four thousand, seven hundred forty-seven".