661266067 has 8 divisors (see below), whose sum is σ = 824435712. Its totient is φ = 515272200.

The previous prime is 661266043. The next prime is 661266071. The reversal of 661266067 is 760662166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661266067 is a prime.

It is a super-3 number, since 3×661266067³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661266167) 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, 4293859 + ... + 4294012.

It is an arithmetic number, because the mean of its divisors is an integer number (103054464).

Almost surely, 2^661266067 is an apocalyptic number.

661266067 is a deficient number, since it is larger than the sum of its proper divisors (163169645).

661266067 is a wasteful number, since it uses less digits than its factorization.

661266067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8587889.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 661266067 is about 25715.0941472124. The cubic root of 661266067 is about 871.2151369138.

The spelling of 661266067 in words is "six hundred sixty-one million, two hundred sixty-six thousand, sixty-seven".