4021665012445 has 8 divisors (see below), whose sum is σ = 4956430393944. Its totient is φ = 3130377090624.

The previous prime is 4021665012439. The next prime is 4021665012461. The reversal of 4021665012445 is 5442105661204.

It can be written as a sum of positive squares in 4 ways, for example, as 1576285272004 + 2445379740441 = 1255502^2 + 1563771^2 .

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 4021665012445 - 2¹¹ = 4021665010397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4021665012398 and 4021665012407.

It is a congruent number.

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, 10869364714 + ... + 10869365083.

It is an arithmetic number, because the mean of its divisors is an integer number (619553799243).

Almost surely, 2^{4021665012445} is an apocalyptic number.

It is an amenable number.

4021665012445 is a deficient number, since it is larger than the sum of its proper divisors (934765381499).

4021665012445 is a wasteful number, since it uses less digits than its factorization.

4021665012445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21738729839.

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 4021665012445 in words is "four trillion, twenty-one billion, six hundred sixty-five million, twelve thousand, four hundred forty-five".