6661065438 has 48 divisors (see below), whose sum is σ = 14540226480. Its totient is φ = 2203815168.

The previous prime is 6661065431. The next prime is 6661065469. The reversal of 6661065438 is 8345601666.

It is a junction number, because it is equal to n+sod(n) for n = 6661065393 and 6661065402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661065431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1428006 + ... + 1432662.

It is an arithmetic number, because the mean of its divisors is an integer number (302921385).

Almost surely, 2^6661065438 is an apocalyptic number.

6661065438 is an abundant number, since it is smaller than the sum of its proper divisors (7879161042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6661065438 is a wasteful number, since it uses less digits than its factorization.

6661065438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5241 (or 5238 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 6661065438 is about 81615.3505046692. The cubic root of 6661065438 is about 1881.5448142758.

The spelling of 6661065438 in words is "six billion, six hundred sixty-one million, sixty-five thousand, four hundred thirty-eight".