686405028619 has 2 divisors, whose sum is σ = 686405028620. Its totient is φ = 686405028618.

The previous prime is 686405028581. The next prime is 686405028643. The reversal of 686405028619 is 916820504686.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686405028619 is a prime.

It is a super-2 number, since 2×686405028619² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 686405028619.

It is not a weakly prime, because it can be changed into another prime (686405028679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343202514309 + 343202514310.

It is an arithmetic number, because the mean of its divisors is an integer number (343202514310).

Almost surely, 2^686405028619 is an apocalyptic number.

686405028619 is a deficient number, since it is larger than the sum of its proper divisors (1).

686405028619 is an equidigital number, since it uses as much as digits as its factorization.

686405028619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 686405028619 in words is "six hundred eighty-six billion, four hundred five million, twenty-eight thousand, six hundred nineteen".