661727713 has 16 divisors (see below), whose sum is σ = 692812800. Its totient is φ = 631249920.

The previous prime is 661727707. The next prime is 661727719. The reversal of 661727713 is 317727166.

661727713 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (661727707) and next prime (661727719).

It is a cyclic number.

It is not a de Polignac number, because 661727713 - 2⁵ = 661727681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661727719) 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, 1068718 + ... + 1069336.

It is an arithmetic number, because the mean of its divisors is an integer number (43300800).

Almost surely, 2^661727713 is an apocalyptic number.

It is an amenable number.

661727713 is a deficient number, since it is larger than the sum of its proper divisors (31085087).

661727713 is a wasteful number, since it uses less digits than its factorization.

661727713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032.

The product of its digits is 74088, while the sum is 40.

The square root of 661727713 is about 25724.0687489363. The cubic root of 661727713 is about 871.4178286118.

The spelling of 661727713 in words is "six hundred sixty-one million, seven hundred twenty-seven thousand, seven hundred thirteen".