671766605061 has 4 divisors (see below), whose sum is σ = 895688806752. Its totient is φ = 447844403372.

The previous prime is 671766605051. The next prime is 671766605119. The reversal of 671766605061 is 160506667176.

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 671766605061 - 2⁶ = 671766604997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 671766604995 and 671766605013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671766605011) 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, 111961100841 + ... + 111961100846.

It is an arithmetic number, because the mean of its divisors is an integer number (223922201688).

Almost surely, 2^671766605061 is an apocalyptic number.

It is an amenable number.

671766605061 is a deficient number, since it is larger than the sum of its proper divisors (223922201691).

671766605061 is a wasteful number, since it uses less digits than its factorization.

671766605061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223922201690.

The product of its (nonzero) digits is 1905120, while the sum is 51.

The spelling of 671766605061 in words is "six hundred seventy-one billion, seven hundred sixty-six million, six hundred five thousand, sixty-one".