671887037618 has 8 divisors (see below), whose sum is σ = 1007834222748. Its totient is φ = 335942296704.

The previous prime is 671887037609. The next prime is 671887037621. The reversal of 671887037618 is 816730788176.

It can be written as a sum of positive squares in 2 ways, for example, as 650543872969 + 21343164649 = 806563^2 + 146093^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×671887037618² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 432830 + ... + 1237382.

Almost surely, 2^671887037618 is an apocalyptic number.

671887037618 is a deficient number, since it is larger than the sum of its proper divisors (335947185130).

671887037618 is a wasteful number, since it uses less digits than its factorization.

671887037618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222108.

The product of its (nonzero) digits is 18966528, while the sum is 62.

The spelling of 671887037618 in words is "six hundred seventy-one billion, eight hundred eighty-seven million, thirty-seven thousand, six hundred eighteen".