4140165621 has 4 divisors (see below), whose sum is σ = 5520220832. Its totient is φ = 2760110412.

The previous prime is 4140165551. The next prime is 4140165629. The reversal of 4140165621 is 1265610414.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4140165621 - 2¹⁸ = 4139903477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4140165629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690027601 + ... + 690027606.

It is an arithmetic number, because the mean of its divisors is an integer number (1380055208).

Almost surely, 2^4140165621 is an apocalyptic number.

It is an amenable number.

4140165621 is a deficient number, since it is larger than the sum of its proper divisors (1380055211).

4140165621 is a wasteful number, since it uses less digits than its factorization.

4140165621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380055210.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 4140165621 is about 64344.1187755338. The cubic root of 4140165621 is about 1605.7301855110.

The spelling of 4140165621 in words is "four billion, one hundred forty million, one hundred sixty-five thousand, six hundred twenty-one".