684086198091 has 4 divisors (see below), whose sum is σ = 912114930792. Its totient is φ = 456057465392.

The previous prime is 684086198087. The next prime is 684086198101. The reversal of 684086198091 is 190891680486.

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 684086198091 - 2² = 684086198087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684086198491) 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, 114014366346 + ... + 114014366351.

It is an arithmetic number, because the mean of its divisors is an integer number (228028732698).

Almost surely, 2^684086198091 is an apocalyptic number.

684086198091 is a deficient number, since it is larger than the sum of its proper divisors (228028732701).

684086198091 is a wasteful number, since it uses less digits than its factorization.

684086198091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228028732700.

The product of its (nonzero) digits is 5971968, while the sum is 60.

The spelling of 684086198091 in words is "six hundred eighty-four billion, eighty-six million, one hundred ninety-eight thousand, ninety-one".