687326066731 has 4 divisors (see below), whose sum is σ = 688199417032. Its totient is φ = 686452716432.

The previous prime is 687326066711. The next prime is 687326066741. The reversal of 687326066731 is 137660623786.

It is a happy number.

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 687326066731 - 2¹⁵ = 687326033963 is a prime.

It is a super-2 number, since 2×687326066731² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687326066711) 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, 436673970 + ... + 436675543.

It is an arithmetic number, because the mean of its divisors is an integer number (172049854258).

Almost surely, 2^687326066731 is an apocalyptic number.

687326066731 is a deficient number, since it is larger than the sum of its proper divisors (873350301).

687326066731 is an equidigital number, since it uses as much as digits as its factorization.

687326066731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873350300.

The product of its (nonzero) digits is 9144576, while the sum is 55.

The spelling of 687326066731 in words is "six hundred eighty-seven billion, three hundred twenty-six million, sixty-six thousand, seven hundred thirty-one".