72010000006666 has 4 divisors (see below), whose sum is σ = 108015000010002. Its totient is φ = 36005000003332.

The previous prime is 72010000006663. The next prime is 72010000006687. The reversal of 72010000006666 is 66660000001027.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 69043286574441 + 2966713432225 = 8309229^2 + 1722415^2 .

It is not an unprimeable number, because it can be changed into a prime (72010000006663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18002500001665 + ... + 18002500001668.

Almost surely, 2^{72010000006666} is an apocalyptic number.

72010000006666 is a deficient number, since it is larger than the sum of its proper divisors (36005000003336).

72010000006666 is a wasteful number, since it uses less digits than its factorization.

72010000006666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36005000003335.

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 72010000006666 in words is "seventy-two trillion, ten billion, six thousand, six hundred sixty-six".