1687667764964 has 18 divisors (see below), whose sum is σ = 3051763439382. Its totient is φ = 816613432800.

The previous prime is 1687667764963. The next prime is 1687667764997. The reversal of 1687667764964 is 4694677667861.

It can be written as a sum of positive squares in only one way, i.e., 1621751310400 + 65916454564 = 1273480^2 + 256742^2 .

It is not an unprimeable number, because it can be changed into a prime (1687667764963) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219515897 + ... + 219523584.

It is an arithmetic number, because the mean of its divisors is an integer number (169542413299).

Almost surely, 2^{1687667764964} is an apocalyptic number.

It is an amenable number.

1687667764964 is a deficient number, since it is larger than the sum of its proper divisors (1364095674418).

1687667764964 is a wasteful number, since it uses less digits than its factorization.

1687667764964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439039547 (or 439039514 counting only the distinct ones).

The product of its digits is 3072577536, while the sum is 77.

The spelling of 1687667764964 in words is "one trillion, six hundred eighty-seven billion, six hundred sixty-seven million, seven hundred sixty-four thousand, nine hundred sixty-four".