671622216858 has 48 divisors (see below), whose sum is σ = 1463805997056. Its totient is φ = 222547600800.

The previous prime is 671622216857. The next prime is 671622216887. The reversal of 671622216858 is 858612226176.

671622216858 is a `hidden beast` number, since 6 + 7 + 1 + 622 + 2 + 1 + 6 + 8 + 5 + 8 = 666.

It is a Curzon 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 23 ways as a sum of consecutive naturals, for example, 31599591 + ... + 31620837.

It is an arithmetic number, because the mean of its divisors is an integer number (30495958272).

Almost surely, 2^671622216858 is an apocalyptic number.

671622216858 is an abundant number, since it is smaller than the sum of its proper divisors (792183780198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671622216858 is a wasteful number, since it uses less digits than its factorization.

671622216858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31579 (or 31576 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The spelling of 671622216858 in words is "six hundred seventy-one billion, six hundred twenty-two million, two hundred sixteen thousand, eight hundred fifty-eight".