1653665646 has 16 divisors (see below), whose sum is σ = 3481401600. Its totient is φ = 522210168.

The previous prime is 1653665641. The next prime is 1653665647. The reversal of 1653665646 is 6465663561.

It is a super-2 number, since 2×1653665646² = 5469220137521194632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1653665595 and 1653665604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1653665641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7252806 + ... + 7253033.

It is an arithmetic number, because the mean of its divisors is an integer number (217587600).

Almost surely, 2^1653665646 is an apocalyptic number.

1653665646 is an abundant number, since it is smaller than the sum of its proper divisors (1827735954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1653665646 is a wasteful number, since it uses less digits than its factorization.

1653665646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14505863.

The product of its digits is 2332800, while the sum is 48.

The square root of 1653665646 is about 40665.2879738973. The cubic root of 1653665646 is about 1182.5401675602.

The spelling of 1653665646 in words is "one billion, six hundred fifty-three million, six hundred sixty-five thousand, six hundred forty-six".