671155052581 has 8 divisors (see below), whose sum is σ = 722804675040. Its totient is φ = 619508617392.

The previous prime is 671155052569. The next prime is 671155052627. The reversal of 671155052581 is 185250551176.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 671155052581 - 2⁷ = 671155052453 is a prime.

It is a super-2 number, since 2×671155052581² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671155052081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350191 + ... + 1210348.

It is an arithmetic number, because the mean of its divisors is an integer number (90350584380).

Almost surely, 2^671155052581 is an apocalyptic number.

It is an amenable number.

671155052581 is a deficient number, since it is larger than the sum of its proper divisors (51649622459).

671155052581 is a wasteful number, since it uses less digits than its factorization.

671155052581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593635.

The product of its (nonzero) digits is 420000, while the sum is 46.

The spelling of 671155052581 in words is "six hundred seventy-one billion, one hundred fifty-five million, fifty-two thousand, five hundred eighty-one".