661186967 has 8 divisors (see below), whose sum is σ = 800091936. Its totient is φ = 533394432.

The previous prime is 661186949. The next prime is 661186987. The reversal of 661186967 is 769681166.

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 661186967 - 2⁸ = 661186711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661186907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2777978 + ... + 2778215.

It is an arithmetic number, because the mean of its divisors is an integer number (100011492).

Almost surely, 2^661186967 is an apocalyptic number.

661186967 is a deficient number, since it is larger than the sum of its proper divisors (138904969).

661186967 is a wasteful number, since it uses less digits than its factorization.

661186967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5556217.

The product of its digits is 653184, while the sum is 50.

The square root of 661186967 is about 25713.5560940139. The cubic root of 661186967 is about 871.1803975611.

The spelling of 661186967 in words is "six hundred sixty-one million, one hundred eighty-six thousand, nine hundred sixty-seven".