661802273 has 8 divisors (see below), whose sum is σ = 722735136. Its totient is φ = 600997600.

The previous prime is 661802263. The next prime is 661802287. The reversal of 661802273 is 372208166.

It is a happy number.

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 661802273 - 2²⁴ = 645025057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661802263) 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, 21083 + ... + 42048.

It is an arithmetic number, because the mean of its divisors is an integer number (90341892).

Almost surely, 2^661802273 is an apocalyptic number.

It is an amenable number.

661802273 is a deficient number, since it is larger than the sum of its proper divisors (60932863).

661802273 is a wasteful number, since it uses less digits than its factorization.

661802273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64095.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 661802273 is about 25725.5179345334. The cubic root of 661802273 is about 871.4505563092.

The spelling of 661802273 in words is "six hundred sixty-one million, eight hundred two thousand, two hundred seventy-three".