66871710890 has 32 divisors (see below), whose sum is σ = 120627622224. Its totient is φ = 26691287040.

The previous prime is 66871710839. The next prime is 66871710923. The reversal of 66871710890 is 9801717866.

It can be written as a sum of positive squares in 8 ways, for example, as 23783499961 + 43088210929 = 154219^2 + 207577^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18486362 + ... + 18489978.

Almost surely, 2^66871710890 is an apocalyptic number.

66871710890 is a deficient number, since it is larger than the sum of its proper divisors (53755911334).

66871710890 is a wasteful number, since it uses less digits than its factorization.

66871710890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7082.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The spelling of 66871710890 in words is "sixty-six billion, eight hundred seventy-one million, seven hundred ten thousand, eight hundred ninety".