661316707 has 4 divisors (see below), whose sum is σ = 682649536. Its totient is φ = 639983880.

The previous prime is 661316701. The next prime is 661316741. The reversal of 661316707 is 707613166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661316707 - 2¹¹ = 661314659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661316701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10666368 + ... + 10666429.

It is an arithmetic number, because the mean of its divisors is an integer number (170662384).

Almost surely, 2^661316707 is an apocalyptic number.

661316707 is a deficient number, since it is larger than the sum of its proper divisors (21332829).

661316707 is a wasteful number, since it uses less digits than its factorization.

661316707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21332828.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 661316707 is about 25716.0787640729. The cubic root of 661316707 is about 871.2373756719.

The spelling of 661316707 in words is "six hundred sixty-one million, three hundred sixteen thousand, seven hundred seven".