671155501263661 has 8 divisors (see below), whose sum is σ = 706490118817920. Its totient is φ = 635821948089792.

The previous prime is 671155501263649. The next prime is 671155501263677. The reversal of 671155501263661 is 166362105551176.

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 671155501263661 - 2²⁵ = 671155467709229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671155501263691) 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, 264800620 + ... + 267323173.

It is an arithmetic number, because the mean of its divisors is an integer number (88311264852240).

Almost surely, 2^{671155501263661} is an apocalyptic number.

It is an amenable number.

671155501263661 is a deficient number, since it is larger than the sum of its proper divisors (35334617554259).

671155501263661 is a wasteful number, since it uses less digits than its factorization.

671155501263661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532190195.

The product of its (nonzero) digits is 6804000, while the sum is 55.

The spelling of 671155501263661 in words is "six hundred seventy-one trillion, one hundred fifty-five billion, five hundred one million, two hundred sixty-three thousand, six hundred sixty-one".