667361661 has 16 divisors (see below), whose sum is σ = 901363008. Its totient is φ = 439171200.

The previous prime is 667361623. The next prime is 667361663. The reversal of 667361661 is 166163766.

It is not a de Polignac number, because 667361661 - 2²³ = 658973053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667361663) 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 15 ways as a sum of consecutive naturals, for example, 69906 + ... + 78876.

It is an arithmetic number, because the mean of its divisors is an integer number (56335188).

Almost surely, 2^667361661 is an apocalyptic number.

It is an amenable number.

667361661 is a deficient number, since it is larger than the sum of its proper divisors (234001347).

667361661 is a wasteful number, since it uses less digits than its factorization.

667361661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9292.

The product of its digits is 163296, while the sum is 42.

The square root of 667361661 is about 25833.3439763419. The cubic root of 667361661 is about 873.8839260451.

The spelling of 667361661 in words is "six hundred sixty-seven million, three hundred sixty-one thousand, six hundred sixty-one".