671850218407 has 4 divisors (see below), whose sum is σ = 690008332456. Its totient is φ = 653692104360.

The previous prime is 671850218401. The next prime is 671850218437. The reversal of 671850218407 is 704812058176.

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

It is a cyclic number.

It is not a de Polignac number, because 671850218407 - 2²⁷ = 671716000679 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 (671850218401) 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, 9079056969 + ... + 9079057042.

It is an arithmetic number, because the mean of its divisors is an integer number (172502083114).

Almost surely, 2^671850218407 is an apocalyptic number.

671850218407 is a deficient number, since it is larger than the sum of its proper divisors (18158114049).

671850218407 is a wasteful number, since it uses less digits than its factorization.

671850218407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18158114048.

The product of its (nonzero) digits is 752640, while the sum is 49.

The spelling of 671850218407 in words is "six hundred seventy-one billion, eight hundred fifty million, two hundred eighteen thousand, four hundred seven".