6653945 has 4 divisors (see below), whose sum is σ = 7984740. Its totient is φ = 5323152.

The previous prime is 6653939. The next prime is 6653957. The reversal of 6653945 is 5493566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2524921 + 4129024 = 1589^2 + 2032^2 .

It is a cyclic number.

It is not a de Polignac number, because 6653945 - 2¹² = 6649849 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6653899 and 6653908.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665390 + ... + 665399.

It is an arithmetic number, because the mean of its divisors is an integer number (1996185).

Almost surely, 2^6653945 is an apocalyptic number.

It is an amenable number.

6653945 is a deficient number, since it is larger than the sum of its proper divisors (1330795).

6653945 is a wasteful number, since it uses less digits than its factorization.

6653945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330794.

The product of its digits is 97200, while the sum is 38.

The square root of 6653945 is about 2579.5241809295. The cubic root of 6653945 is about 188.0874140796.

The spelling of 6653945 in words is "six million, six hundred fifty-three thousand, nine hundred forty-five".