661408267 has 8 divisors (see below), whose sum is σ = 712782000. Its totient is φ = 610105440.

The previous prime is 661408243. The next prime is 661408271. The reversal of 661408267 is 762804166.

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 661408267 - 2²³ = 653019659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661408277) 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, 2517 + ... + 36457.

It is an arithmetic number, because the mean of its divisors is an integer number (89097750).

Almost surely, 2^661408267 is an apocalyptic number.

661408267 is a deficient number, since it is larger than the sum of its proper divisors (51373733).

661408267 is a wasteful number, since it uses less digits than its factorization.

661408267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35453.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 661408267 is about 25717.8589116590. The cubic root of 661408267 is about 871.2775817296.

The spelling of 661408267 in words is "six hundred sixty-one million, four hundred eight thousand, two hundred sixty-seven".