8500721956 has 12 divisors (see below), whose sum is σ = 15751337868. Its totient is φ = 4000339712.

The previous prime is 8500721927. The next prime is 8500721963. The reversal of 8500721956 is 6591270058.

It can be written as a sum of positive squares in 2 ways, for example, as 6804600100 + 1696121856 = 82490^2 + 41184^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62505241 + ... + 62505376.

It is an arithmetic number, because the mean of its divisors is an integer number (1312611489).

Almost surely, 2^8500721956 is an apocalyptic number.

It is an amenable number.

8500721956 is a deficient number, since it is larger than the sum of its proper divisors (7250615912).

8500721956 is a wasteful number, since it uses less digits than its factorization.

8500721956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125010638 (or 125010636 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 43.

The square root of 8500721956 is about 92199.3598459339. The cubic root of 8500721956 is about 2040.8853292325.

The spelling of 8500721956 in words is "eight billion, five hundred million, seven hundred twenty-one thousand, nine hundred fifty-six".