687908023919 has 2 divisors, whose sum is σ = 687908023920. Its totient is φ = 687908023918.

The previous prime is 687908023867. The next prime is 687908023951. The reversal of 687908023919 is 919320809786.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687908023919 is a prime.

It is a super-2 number, since 2×687908023919² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687908023219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343954011959 + 343954011960.

It is an arithmetic number, because the mean of its divisors is an integer number (343954011960).

Almost surely, 2^687908023919 is an apocalyptic number.

687908023919 is a deficient number, since it is larger than the sum of its proper divisors (1).

687908023919 is an equidigital number, since it uses as much as digits as its factorization.

687908023919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11757312, while the sum is 62.

The spelling of 687908023919 in words is "six hundred eighty-seven billion, nine hundred eight million, twenty-three thousand, nine hundred nineteen".