661017677 has 8 divisors (see below), whose sum is σ = 713543040. Its totient is φ = 610474480.

The previous prime is 661017673. The next prime is 661017713. The reversal of 661017677 is 776710166.

661017677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 661017677 - 2² = 661017673 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661017673) 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, 494849 + ... + 496182.

It is an arithmetic number, because the mean of its divisors is an integer number (89192880).

Almost surely, 2^661017677 is an apocalyptic number.

It is an amenable number.

661017677 is a deficient number, since it is larger than the sum of its proper divisors (52525363).

661017677 is a wasteful number, since it uses less digits than its factorization.

661017677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991083.

The product of its (nonzero) digits is 74088, while the sum is 41.

The square root of 661017677 is about 25710.2640398733. The cubic root of 661017677 is about 871.1060390081.

The spelling of 661017677 in words is "six hundred sixty-one million, seventeen thousand, six hundred seventy-seven".