1687686460731 has 16 divisors (see below), whose sum is σ = 2500308477600. Its totient is φ = 1125109799424.

The previous prime is 1687686460717. The next prime is 1687686460741. The reversal of 1687686460731 is 1370646867861.

It is a happy number.

1687686460731 is a `hidden beast` number, since 1 + 6 + 87 + 68 + 6 + 460 + 7 + 31 = 666.

It is not a de Polignac number, because 1687686460731 - 2¹⁴ = 1687686444347 is a prime.

It is a super-2 number, since 2×1687686460731² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1687686460741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1987555 + ... + 2706611.

It is an arithmetic number, because the mean of its divisors is an integer number (156269279850).

Almost surely, 2^{1687686460731} is an apocalyptic number.

1687686460731 is a deficient number, since it is larger than the sum of its proper divisors (812622016869).

1687686460731 is an equidigital number, since it uses as much as digits as its factorization.

1687686460731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805995 (or 805989 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 63.

The spelling of 1687686460731 in words is "one trillion, six hundred eighty-seven billion, six hundred eighty-six million, four hundred sixty thousand, seven hundred thirty-one".