671155505 has 8 divisors (see below), whose sum is σ = 805699752. Its totient is φ = 536715648.

The previous prime is 671155423. The next prime is 671155517. The reversal of 671155505 is 505551176.

It can be written as a sum of positive squares in 4 ways, for example, as 160757041 + 510398464 = 12679^2 + 22592^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671155505 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11174 + ... + 38303.

It is an arithmetic number, because the mean of its divisors is an integer number (100712469).

Almost surely, 2^671155505 is an apocalyptic number.

It is an amenable number.

671155505 is a deficient number, since it is larger than the sum of its proper divisors (134544247).

671155505 is a wasteful number, since it uses less digits than its factorization.

671155505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52195.

The product of its (nonzero) digits is 26250, while the sum is 35.

The square root of 671155505 is about 25906.6691220620. The cubic root of 671155505 is about 875.5367612733.

The spelling of 671155505 in words is "six hundred seventy-one million, one hundred fifty-five thousand, five hundred five".