678174821131 has 4 divisors (see below), whose sum is σ = 682666045264. Its totient is φ = 673683597000.

The previous prime is 678174821063. The next prime is 678174821171. The reversal of 678174821131 is 131128471876.

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 678174821131 - 2⁷ = 678174821003 is a prime.

It is a super-2 number, since 2×678174821131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678174821171) 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, 2245611840 + ... + 2245612141.

It is an arithmetic number, because the mean of its divisors is an integer number (170666511316).

Almost surely, 2^678174821131 is an apocalyptic number.

678174821131 is a deficient number, since it is larger than the sum of its proper divisors (4491224133).

678174821131 is a wasteful number, since it uses less digits than its factorization.

678174821131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4491224132.

The product of its digits is 451584, while the sum is 49.

The spelling of 678174821131 in words is "six hundred seventy-eight billion, one hundred seventy-four million, eight hundred twenty-one thousand, one hundred thirty-one".