666469961 has 8 divisors (see below), whose sum is σ = 690177024. Its totient is φ = 642900960.

The previous prime is 666469939. The next prime is 666469963. The reversal of 666469961 is 169964666.

666469961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 666469961 - 2¹⁰ = 666468937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666469963) 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, 24641 + ... + 44046.

It is an arithmetic number, because the mean of its divisors is an integer number (86272128).

Almost surely, 2^666469961 is an apocalyptic number.

It is an amenable number.

666469961 is a deficient number, since it is larger than the sum of its proper divisors (23707063).

666469961 is a wasteful number, since it uses less digits than its factorization.

666469961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69031.

The product of its digits is 2519424, while the sum is 53.

The square root of 666469961 is about 25816.0795048357. The cubic root of 666469961 is about 873.4945371707.

The spelling of 666469961 in words is "six hundred sixty-six million, four hundred sixty-nine thousand, nine hundred sixty-one".