671853949731 has 6 divisors (see below), whose sum is σ = 970455705180. Its totient is φ = 447902633148.

The previous prime is 671853949727. The next prime is 671853949747. The reversal of 671853949731 is 137949358176.

671853949731 is a `hidden beast` number, since 6 + 7 + 1 + 8 + 539 + 4 + 97 + 3 + 1 = 666.

It is not a de Polignac number, because 671853949731 - 2² = 671853949727 is a prime.

It is a super-2 number, since 2×671853949731² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671853949751) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37325219421 + ... + 37325219438.

It is an arithmetic number, because the mean of its divisors is an integer number (161742617530).

Almost surely, 2^671853949731 is an apocalyptic number.

671853949731 is a deficient number, since it is larger than the sum of its proper divisors (298601755449).

671853949731 is a wasteful number, since it uses less digits than its factorization.

671853949731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74650438865 (or 74650438862 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 63.

The spelling of 671853949731 in words is "six hundred seventy-one billion, eight hundred fifty-three million, nine hundred forty-nine thousand, seven hundred thirty-one".