40021646653 has 8 divisors (see below), whose sum is σ = 42413415480. Its totient is φ = 37634050560.

The previous prime is 40021646641. The next prime is 40021646669. The reversal of 40021646653 is 35664612004.

It can be written as a sum of positive squares in 4 ways, for example, as 160326244 + 39861320409 = 12662^2 + 199653^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40021646653 - 2⁹ = 40021646141 is a prime.

It is a super-2 number, since 2×40021646653² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021646633) 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, 1023418 + ... + 1061803.

It is an arithmetic number, because the mean of its divisors is an integer number (5301676935).

Almost surely, 2^40021646653 is an apocalyptic number.

It is an amenable number.

40021646653 is a deficient number, since it is larger than the sum of its proper divisors (2391768827).

40021646653 is a wasteful number, since it uses less digits than its factorization.

40021646653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086367.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 40021646653 in words is "forty billion, twenty-one million, six hundred forty-six thousand, six hundred fifty-three".