671678842564 has 12 divisors (see below), whose sum is σ = 1177440428304. Its totient is φ = 335267291624.

The previous prime is 671678842561. The next prime is 671678842607. The reversal of 671678842564 is 465248876176.

It is a super-2 number, since 2×671678842564² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 671678842496 and 671678842505.

It is not an unprimeable number, because it can be changed into a prime (671678842561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143029774 + ... + 143034469.

It is an arithmetic number, because the mean of its divisors is an integer number (98120035692).

Almost surely, 2^671678842564 is an apocalyptic number.

It is an amenable number.

671678842564 is a deficient number, since it is larger than the sum of its proper divisors (505761585740).

671678842564 is a wasteful number, since it uses less digits than its factorization.

671678842564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286064834 (or 286064832 counting only the distinct ones).

The product of its digits is 108380160, while the sum is 64.

The spelling of 671678842564 in words is "six hundred seventy-one billion, six hundred seventy-eight million, eight hundred forty-two thousand, five hundred sixty-four".