671007440077 has 4 divisors (see below), whose sum is σ = 722623397020. Its totient is φ = 619391483136.

The previous prime is 671007440053. The next prime is 671007440111. The reversal of 671007440077 is 770044700176.

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 417091222276 + 253916217801 = 645826^2 + 503901^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671007440077 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 (671007420077) 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, 25807978452 + ... + 25807978477.

It is an arithmetic number, because the mean of its divisors is an integer number (180655849255).

Almost surely, 2^671007440077 is an apocalyptic number.

It is an amenable number.

671007440077 is a deficient number, since it is larger than the sum of its proper divisors (51615956943).

671007440077 is a wasteful number, since it uses less digits than its factorization.

671007440077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51615956942.

The product of its (nonzero) digits is 230496, while the sum is 43.

The spelling of 671007440077 in words is "six hundred seventy-one billion, seven million, four hundred forty thousand, seventy-seven".