671081444653 has 4 divisors (see below), whose sum is σ = 671083274368. Its totient is φ = 671079614940.

The previous prime is 671081444611. The next prime is 671081444669. The reversal of 671081444653 is 356444180176.

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 not a de Polignac number, because 671081444653 - 2¹³ = 671081436461 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 671081444597 and 671081444606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671081444953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153501 + ... + 1168642.

It is an arithmetic number, because the mean of its divisors is an integer number (167770818592).

Almost surely, 2^671081444653 is an apocalyptic number.

It is an amenable number.

671081444653 is a deficient number, since it is larger than the sum of its proper divisors (1829715).

671081444653 is a wasteful number, since it uses less digits than its factorization.

671081444653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829714.

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 671081444653 in words is "six hundred seventy-one billion, eighty-one million, four hundred forty-four thousand, six hundred fifty-three".