671657757511 has 4 divisors (see below), whose sum is σ = 723323738872. Its totient is φ = 619991776152.

The previous prime is 671657757509. The next prime is 671657757517. The reversal of 671657757511 is 115757756176.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 671657757511 - 2¹ = 671657757509 is a prime.

It is a super-2 number, since 2×671657757511² (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 (671657757517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25832990661 + ... + 25832990686.

It is an arithmetic number, because the mean of its divisors is an integer number (180830934718).

Almost surely, 2^671657757511 is an apocalyptic number.

671657757511 is a deficient number, since it is larger than the sum of its proper divisors (51665981361).

671657757511 is a wasteful number, since it uses less digits than its factorization.

671657757511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51665981360.

The product of its digits is 10804500, while the sum is 58.

The spelling of 671657757511 in words is "six hundred seventy-one billion, six hundred fifty-seven million, seven hundred fifty-seven thousand, five hundred eleven".