6661435540 has 12 divisors (see below), whose sum is σ = 13989014676. Its totient is φ = 2664574208.

The previous prime is 6661435481. The next prime is 6661435591. The reversal of 6661435540 is 455341666.

It can be written as a sum of positive squares in 2 ways, for example, as 3543106576 + 3118328964 = 59524^2 + 55842^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6661435493 and 6661435502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166535869 + ... + 166535908.

It is an arithmetic number, because the mean of its divisors is an integer number (1165751223).

Almost surely, 2^6661435540 is an apocalyptic number.

It is an amenable number.

6661435540 is an abundant number, since it is smaller than the sum of its proper divisors (7327579136).

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

6661435540 is a wasteful number, since it uses less digits than its factorization.

6661435540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333071786 (or 333071784 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 6661435540 is about 81617.6178285056. The cubic root of 6661435540 is about 1881.5796610836.

The spelling of 6661435540 in words is "six billion, six hundred sixty-one million, four hundred thirty-five thousand, five hundred forty".