685683014378 has 4 divisors (see below), whose sum is σ = 1028524521570. Its totient is φ = 342841507188.

The previous prime is 685683014377. The next prime is 685683014383. The reversal of 685683014378 is 873410386586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 685655209849 + 27804529 = 828043^2 + 5273^2 .

It is a super-2 number, since 2×685683014378² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (685683014377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171420753593 + ... + 171420753596.

Almost surely, 2^685683014378 is an apocalyptic number.

685683014378 is a deficient number, since it is larger than the sum of its proper divisors (342841507192).

685683014378 is a wasteful number, since it uses less digits than its factorization.

685683014378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342841507191.

The product of its (nonzero) digits is 23224320, while the sum is 59.

The spelling of 685683014378 in words is "six hundred eighty-five billion, six hundred eighty-three million, fourteen thousand, three hundred seventy-eight".