671661000452 has 12 divisors (see below), whose sum is σ = 1265822654796. Its totient is φ = 309997384800.

The previous prime is 671661000433. The next prime is 671661000473. The reversal of 671661000452 is 254000166176.

It can be written as a sum of positive squares in 2 ways, for example, as 325109793856 + 346551206596 = 570184^2 + 588686^2 .

It is a super-2 number, since 2×671661000452² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6458278799 + ... + 6458278902.

It is an arithmetic number, because the mean of its divisors is an integer number (105485221233).

Almost surely, 2^671661000452 is an apocalyptic number.

It is an amenable number.

671661000452 is a deficient number, since it is larger than the sum of its proper divisors (594161654344).

671661000452 is a wasteful number, since it uses less digits than its factorization.

671661000452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12916557718 (or 12916557716 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 671661000452 in words is "six hundred seventy-one billion, six hundred sixty-one million, four hundred fifty-two", and thus it is an aban number.