661867273 has 8 divisors (see below), whose sum is σ = 701224992. Its totient is φ = 622556736.

The previous prime is 661867253. The next prime is 661867303. The reversal of 661867273 is 372768166.

661867273 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 661867273 - 2²¹ = 659770121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661867253) 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, 19486 + ... + 41272.

It is an arithmetic number, because the mean of its divisors is an integer number (87653124).

Almost surely, 2^661867273 is an apocalyptic number.

It is an amenable number.

661867273 is a deficient number, since it is larger than the sum of its proper divisors (39357719).

661867273 is a wasteful number, since it uses less digits than its factorization.

661867273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23591.

The product of its digits is 508032, while the sum is 46.

The square root of 661867273 is about 25726.7812405672. The cubic root of 661867273 is about 871.4790856923.

The spelling of 661867273 in words is "six hundred sixty-one million, eight hundred sixty-seven thousand, two hundred seventy-three".