1653242665 has 8 divisors (see below), whose sum is σ = 1989577800. Its totient is φ = 1318803072.

The previous prime is 1653242641. The next prime is 1653242681. The reversal of 1653242665 is 5662423561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 437186281 + 1216056384 = 20909^2 + 34872^2 .

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 1653242665 - 2²¹ = 1651145513 is a prime.

It is a super-2 number, since 2×1653242665² = 5466422618752604450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 471964 + ... + 475453.

It is an arithmetic number, because the mean of its divisors is an integer number (248697225).

Almost surely, 2^1653242665 is an apocalyptic number.

It is an amenable number.

1653242665 is a deficient number, since it is larger than the sum of its proper divisors (336335135).

1653242665 is an equidigital number, since it uses as much as digits as its factorization.

1653242665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947771.

The product of its digits is 259200, while the sum is 40.

The square root of 1653242665 is about 40660.0868789037. The cubic root of 1653242665 is about 1182.4393340620.

The spelling of 1653242665 in words is "one billion, six hundred fifty-three million, two hundred forty-two thousand, six hundred sixty-five".