687139892773 has 2 divisors, whose sum is σ = 687139892774. Its totient is φ = 687139892772.

The previous prime is 687139892749. The next prime is 687139892779. The reversal of 687139892773 is 377298931786.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 555677811844 + 131462080929 = 745438^2 + 362577^2 .

It is a cyclic number.

It is not a de Polignac number, because 687139892773 - 2⁵ = 687139892741 is a prime.

It is a super-2 number, since 2×687139892773² (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 (687139892779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343569946386 + 343569946387.

It is an arithmetic number, because the mean of its divisors is an integer number (343569946387).

Almost surely, 2^687139892773 is an apocalyptic number.

It is an amenable number.

687139892773 is a deficient number, since it is larger than the sum of its proper divisors (1).

687139892773 is an equidigital number, since it uses as much as digits as its factorization.

687139892773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192036096, while the sum is 70.

The spelling of 687139892773 in words is "six hundred eighty-seven billion, one hundred thirty-nine million, eight hundred ninety-two thousand, seven hundred seventy-three".