661167361 has 8 divisors (see below), whose sum is σ = 691524864. Its totient is φ = 630944160.

The previous prime is 661167347. The next prime is 661167371. The reversal of 661167361 is 163761166.

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 661167361 - 2⁵ = 661167329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661167361.

It is not an unprimeable number, because it can be changed into a prime (661167371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23436 + ... + 43261.

It is an arithmetic number, because the mean of its divisors is an integer number (86440608).

Almost surely, 2^661167361 is an apocalyptic number.

It is an amenable number.

661167361 is a deficient number, since it is larger than the sum of its proper divisors (30357503).

661167361 is a wasteful number, since it uses less digits than its factorization.

661167361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67151.

The product of its digits is 27216, while the sum is 37.

The square root of 661167361 is about 25713.1748525926. The cubic root of 661167361 is about 871.1717865164.

The spelling of 661167361 in words is "six hundred sixty-one million, one hundred sixty-seven thousand, three hundred sixty-one".