70565720666 has 16 divisors (see below), whose sum is σ = 120981041856. Its totient is φ = 30239642976.

The previous prime is 70565720657. The next prime is 70565720671. The reversal of 70565720666 is 66602756507.

It is a super-2 number, since 2×70565720666² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74171 + ... + 382926.

It is an arithmetic number, because the mean of its divisors is an integer number (7561315116).

Almost surely, 2^70565720666 is an apocalyptic number.

70565720666 is a deficient number, since it is larger than the sum of its proper divisors (50415321190).

70565720666 is a wasteful number, since it uses less digits than its factorization.

70565720666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468133.

The product of its (nonzero) digits is 3175200, while the sum is 50.

The spelling of 70565720666 in words is "seventy billion, five hundred sixty-five million, seven hundred twenty thousand, six hundred sixty-six".