671765788406 has 4 divisors (see below), whose sum is σ = 1007648682612. Its totient is φ = 335882894202.

The previous prime is 671765788381. The next prime is 671765788411. The reversal of 671765788406 is 604887567176.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167941447100 + ... + 167941447103.

It is an arithmetic number, because the mean of its divisors is an integer number (251912170653).

Almost surely, 2^671765788406 is an apocalyptic number.

671765788406 is a deficient number, since it is larger than the sum of its proper divisors (335882894206).

671765788406 is a wasteful number, since it uses less digits than its factorization.

671765788406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335882894205.

The product of its (nonzero) digits is 94832640, while the sum is 65.

The spelling of 671765788406 in words is "six hundred seventy-one billion, seven hundred sixty-five million, seven hundred eighty-eight thousand, four hundred six".