671321761005 has 16 divisors (see below), whose sum is σ = 1227559791744. Its totient is φ = 306889947840.

The previous prime is 671321761003. The next prime is 671321761007. The reversal of 671321761005 is 500167123176.

It is an interprime number because it is at equal distance from previous prime (671321761003) and next prime (671321761007).

It is not a de Polignac number, because 671321761005 - 2¹ = 671321761003 is a prime.

It is a super-2 number, since 2×671321761005² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671321761003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3196770186 + ... + 3196770395.

It is an arithmetic number, because the mean of its divisors is an integer number (76722486984).

Almost surely, 2^671321761005 is an apocalyptic number.

It is an amenable number.

671321761005 is a deficient number, since it is larger than the sum of its proper divisors (556238030739).

671321761005 is a wasteful number, since it uses less digits than its factorization.

671321761005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6393540596.

The product of its (nonzero) digits is 52920, while the sum is 39.

The spelling of 671321761005 in words is "six hundred seventy-one billion, three hundred twenty-one million, seven hundred sixty-one thousand, five".