40665644653 has 8 divisors (see below), whose sum is σ = 42861333600. Its totient is φ = 38475494928.

The previous prime is 40665644647. The next prime is 40665644671. The reversal of 40665644653 is 35644656604.

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 40665644653 - 2¹³ = 40665636461 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40665644597 and 40665644606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40665645653) 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, 1369723 + ... + 1399096.

It is an arithmetic number, because the mean of its divisors is an integer number (5357666700).

Almost surely, 2^40665644653 is an apocalyptic number.

It is an amenable number.

40665644653 is a deficient number, since it is larger than the sum of its proper divisors (2195688947).

40665644653 is a wasteful number, since it uses less digits than its factorization.

40665644653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769611.

The product of its (nonzero) digits is 6220800, while the sum is 49.

The spelling of 40665644653 in words is "forty billion, six hundred sixty-five million, six hundred forty-four thousand, six hundred fifty-three".