671811646001 has 4 divisors (see below), whose sum is σ = 671816469504. Its totient is φ = 671806822500.

The previous prime is 671811645979. The next prime is 671811646007. The reversal of 671811646001 is 100646118176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671811646001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671811646001.

It is not an unprimeable number, because it can be changed into a prime (671811646007) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2196425 + ... + 2483526.

It is an arithmetic number, because the mean of its divisors is an integer number (167954117376).

Almost surely, 2^671811646001 is an apocalyptic number.

It is an amenable number.

671811646001 is a deficient number, since it is larger than the sum of its proper divisors (4823503).

671811646001 is a wasteful number, since it uses less digits than its factorization.

671811646001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4823502.

The product of its (nonzero) digits is 48384, while the sum is 41.

The spelling of 671811646001 in words is "six hundred seventy-one billion, eight hundred eleven million, six hundred forty-six thousand, one".