66640571670 has 16 divisors (see below), whose sum is σ = 159937372080. Its totient is φ = 17770819104.

The previous prime is 66640571653. The next prime is 66640571687. The reversal of 66640571670 is 7617504666.

It is an interprime number because it is at equal distance from previous prime (66640571653) and next prime (66640571687).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110676165 + ... + 1110676224.

It is an arithmetic number, because the mean of its divisors is an integer number (9996085755).

Almost surely, 2^66640571670 is an apocalyptic number.

66640571670 is an abundant number, since it is smaller than the sum of its proper divisors (93296800410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66640571670 is a wasteful number, since it uses less digits than its factorization.

66640571670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221352399.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 66640571670 in words is "sixty-six billion, six hundred forty million, five hundred seventy-one thousand, six hundred seventy".