684478833386 has 4 divisors (see below), whose sum is σ = 1026718250082. Its totient is φ = 342239416692.

The previous prime is 684478833343. The next prime is 684478833391. The reversal of 684478833386 is 683338874486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 683338874486 = 2 ⋅341669437243.

It can be written as a sum of positive squares in only one way, i.e., 556618952761 + 127859880625 = 746069^2 + 357575^2 .

It is a super-2 number, since 2×684478833386² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171119708345 + ... + 171119708348.

Almost surely, 2^684478833386 is an apocalyptic number.

684478833386 is a deficient number, since it is larger than the sum of its proper divisors (342239416696).

684478833386 is a wasteful number, since it uses less digits than its factorization.

684478833386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342239416695.

The product of its digits is 445906944, while the sum is 68.

The spelling of 684478833386 in words is "six hundred eighty-four billion, four hundred seventy-eight million, eight hundred thirty-three thousand, three hundred eighty-six".