671377044061 has 4 divisors (see below), whose sum is σ = 671380064572. Its totient is φ = 671374023552.

The previous prime is 671377044059. The next prime is 671377044089. The reversal of 671377044061 is 160440773176.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5790296836 + 665586747225 = 76094^2 + 815835^2 .

It is a cyclic number.

It is not a de Polignac number, because 671377044061 - 2¹ = 671377044059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671377024061) 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, 1147860 + ... + 1631053.

It is an arithmetic number, because the mean of its divisors is an integer number (167845016143).

Almost surely, 2^671377044061 is an apocalyptic number.

It is an amenable number.

671377044061 is a deficient number, since it is larger than the sum of its proper divisors (3020511).

671377044061 is a wasteful number, since it uses less digits than its factorization.

671377044061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020510.

The product of its (nonzero) digits is 592704, while the sum is 46.

The spelling of 671377044061 in words is "six hundred seventy-one billion, three hundred seventy-seven million, forty-four thousand, sixty-one".