661063247 has 8 divisors (see below), whose sum is σ = 715530816. Its totient is φ = 607112352.

The previous prime is 661063243. The next prime is 661063261. The reversal of 661063247 is 742360166.

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 661063247 - 2² = 661063243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661063243) 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, 126503 + ... + 131624.

It is an arithmetic number, because the mean of its divisors is an integer number (89441352).

Almost surely, 2^661063247 is an apocalyptic number.

661063247 is a deficient number, since it is larger than the sum of its proper divisors (54467569).

661063247 is a wasteful number, since it uses less digits than its factorization.

661063247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258337.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 661063247 is about 25711.1502465370. The cubic root of 661063247 is about 871.1260563195.

The spelling of 661063247 in words is "six hundred sixty-one million, sixty-three thousand, two hundred forty-seven".