678685129536 has 28 divisors (see below), whose sum is σ = 1795687739072. Its totient is φ = 226228376448.

The previous prime is 678685129511. The next prime is 678685129547. The reversal of 678685129536 is 635921586876.

It is a super-2 number, since 2×678685129536² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 1767409000 + ... + 1767409383.

Almost surely, 2^678685129536 is an apocalyptic number.

It is an amenable number.

678685129536 is an abundant number, since it is smaller than the sum of its proper divisors (1117002609536).

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

678685129536 is a wasteful number, since it uses less digits than its factorization.

678685129536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3534818398 (or 3534818388 counting only the distinct ones).

The product of its digits is 130636800, while the sum is 66.

The spelling of 678685129536 in words is "six hundred seventy-eight billion, six hundred eighty-five million, one hundred twenty-nine thousand, five hundred thirty-six".