83556709666 has 8 divisors (see below), whose sum is σ = 126627178860. Its totient is φ = 41347650048.

The previous prime is 83556709633. The next prime is 83556709669. The reversal of 83556709666 is 66690765538.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 77514912225 + 6041797441 = 278415^2 + 77729^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (83556709669) 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, 215352151 + ... + 215352538.

Almost surely, 2^83556709666 is an apocalyptic number.

83556709666 is a deficient number, since it is larger than the sum of its proper divisors (43070469194).

83556709666 is a wasteful number, since it uses less digits than its factorization.

83556709666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430704788.

The product of its (nonzero) digits is 48988800, while the sum is 61.

The spelling of 83556709666 in words is "eighty-three billion, five hundred fifty-six million, seven hundred nine thousand, six hundred sixty-six".