671622216557 has 4 divisors (see below), whose sum is σ = 672094194240.
Its totient is φ = 671150238876.
The previous prime is 671622216523. The next prime is 671622216571. The reversal of 671622216557 is 755612226176.
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 671622216557 - 26 = 671622216493 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 (671622216857) 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, 235986707 + ... + 235989552.
It is an arithmetic number, because the mean of its divisors is an integer number (168023548560).
Almost surely, 2671622216557 is an apocalyptic number.
It is an amenable number.
671622216557 is a deficient number, since it is larger than the sum of its proper divisors (471977683).
671622216557 is a wasteful number, since it uses less digits than its factorization.
671622216557 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 471977682.
The product of its digits is 2116800, while the sum is 50.
The spelling of 671622216557 in words is "six hundred seventy-one billion, six hundred twenty-two million, two hundred sixteen thousand, five hundred fifty-seven".