6640622141 has 4 divisors (see below), whose sum is σ = 6641045052. Its totient is φ = 6640199232.

The previous prime is 6640622117. The next prime is 6640622167. The reversal of 6640622141 is 1412260466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1412260466 = 2 ⋅706130233.

It can be written as a sum of positive squares in 2 ways, for example, as 704690116 + 5935932025 = 26546^2 + 77045^2 .

It is a cyclic number.

It is not a de Polignac number, because 6640622141 - 2³⁰ = 5566880317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6640622098 and 6640622107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640622111) 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, 186956 + ... + 219621.

It is an arithmetic number, because the mean of its divisors is an integer number (1660261263).

Almost surely, 2^6640622141 is an apocalyptic number.

It is an amenable number.

6640622141 is a deficient number, since it is larger than the sum of its proper divisors (422911).

6640622141 is a wasteful number, since it uses less digits than its factorization.

6640622141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422910.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 6640622141 is about 81490.0125230080. The cubic root of 6640622141 is about 1879.6179755111.

The spelling of 6640622141 in words is "six billion, six hundred forty million, six hundred twenty-two thousand, one hundred forty-one".