8500721707 has 2 divisors, whose sum is σ = 8500721708. Its totient is φ = 8500721706.

The previous prime is 8500721687. The next prime is 8500721741. The reversal of 8500721707 is 7071270058.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8500721707 - 2²⁷ = 8366503979 is a prime.

It is not a weakly prime, because it can be changed into another prime (8500725707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4250360853 + 4250360854.

It is an arithmetic number, because the mean of its divisors is an integer number (4250360854).

Almost surely, 2^8500721707 is an apocalyptic number.

8500721707 is a deficient number, since it is larger than the sum of its proper divisors (1).

8500721707 is an equidigital number, since it uses as much as digits as its factorization.

8500721707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 8500721707 is about 92199.3584955991. The cubic root of 8500721707 is about 2040.8853093056.

The spelling of 8500721707 in words is "eight billion, five hundred million, seven hundred twenty-one thousand, seven hundred seven".