667436261 has 16 divisors (see below), whose sum is σ = 694552320. Its totient is φ = 640960320.

The previous prime is 667436257. The next prime is 667436279. The reversal of 667436261 is 162634766.

It is a cyclic number.

It is not a de Polignac number, because 667436261 - 2² = 667436257 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 (667436221) 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, 1441316 + ... + 1441778.

It is an arithmetic number, because the mean of its divisors is an integer number (43409520).

Almost surely, 2^667436261 is an apocalyptic number.

It is an amenable number.

667436261 is a deficient number, since it is larger than the sum of its proper divisors (27116059).

667436261 is a wasteful number, since it uses less digits than its factorization.

667436261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036.

The product of its digits is 217728, while the sum is 41.

The square root of 667436261 is about 25834.7878063668. The cubic root of 667436261 is about 873.9164867568.

The spelling of 667436261 in words is "six hundred sixty-seven million, four hundred thirty-six thousand, two hundred sixty-one".