671615205470761 has 4 divisors (see below), whose sum is σ = 671665737062224. Its totient is φ = 671564673879300.

The previous prime is 671615205470743. The next prime is 671615205470837. The reversal of 671615205470761 is 167074502516176.

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 671615205470761 - 2¹⁵ = 671615205437993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 671615205470696 and 671615205470705.

It is not an unprimeable number, because it can be changed into a prime (671615205470701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25265775795 + ... + 25265802376.

It is an arithmetic number, because the mean of its divisors is an integer number (167916434265556).

Almost surely, 2^{671615205470761} is an apocalyptic number.

It is an amenable number.

671615205470761 is a deficient number, since it is larger than the sum of its proper divisors (50531591463).

671615205470761 is a wasteful number, since it uses less digits than its factorization.

671615205470761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50531591462.

The product of its (nonzero) digits is 14817600, while the sum is 58.

The spelling of 671615205470761 in words is "six hundred seventy-one trillion, six hundred fifteen billion, two hundred five million, four hundred seventy thousand, seven hundred sixty-one".