685776995 has 4 divisors (see below), whose sum is σ = 822932400. Its totient is φ = 548621592.

The previous prime is 685776989. The next prime is 685776997. The reversal of 685776995 is 599677586.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 599677586 = 2 ⋅299838793.

It is a cyclic number.

It is not a de Polignac number, because 685776995 - 2⁸ = 685776739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685776997) 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, 68577695 + ... + 68577704.

It is an arithmetic number, because the mean of its divisors is an integer number (205733100).

Almost surely, 2^685776995 is an apocalyptic number.

685776995 is a deficient number, since it is larger than the sum of its proper divisors (137155405).

685776995 is a wasteful number, since it uses less digits than its factorization.

685776995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137155404.

The product of its digits is 28576800, while the sum is 62.

The square root of 685776995 is about 26187.3441761474. The cubic root of 685776995 is about 881.8491569859.

The spelling of 685776995 in words is "six hundred eighty-five million, seven hundred seventy-six thousand, nine hundred ninety-five".