671136300781 has 4 divisors (see below), whose sum is σ = 706459264000. Its totient is φ = 635813337564.

The previous prime is 671136300773. The next prime is 671136300797. The reversal of 671136300781 is 187003631176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 671136300781 - 2³ = 671136300773 is a prime.

It is a super-2 number, since 2×671136300781² (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 (671136300701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17661481581 + ... + 17661481618.

It is an arithmetic number, because the mean of its divisors is an integer number (176614816000).

Almost surely, 2^671136300781 is an apocalyptic number.

It is an amenable number.

671136300781 is a deficient number, since it is larger than the sum of its proper divisors (35322963219).

671136300781 is a wasteful number, since it uses less digits than its factorization.

671136300781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35322963218.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 671136300781 in words is "six hundred seventy-one billion, one hundred thirty-six million, three hundred thousand, seven hundred eighty-one".