6660566542 has 16 divisors (see below), whose sum is σ = 11422966752. Its totient is φ = 2853315360.

The previous prime is 6660566533. The next prime is 6660566557. The reversal of 6660566542 is 2456650666.

It is a junction number, because it is equal to n+sod(n) for n = 6660566492 and 6660566501.

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, 66573 + ... + 133240.

It is an arithmetic number, because the mean of its divisors is an integer number (713935422).

Almost surely, 2^6660566542 is an apocalyptic number.

6660566542 is a deficient number, since it is larger than the sum of its proper divisors (4762400210).

6660566542 is a wasteful number, since it uses less digits than its factorization.

6660566542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202203.

The product of its (nonzero) digits is 1555200, while the sum is 46.

The square root of 6660566542 is about 81612.2940616179. The cubic root of 6660566542 is about 1881.4978388769.

The spelling of 6660566542 in words is "six billion, six hundred sixty million, five hundred sixty-six thousand, five hundred forty-two".