1687016699 has 4 divisors (see below), whose sum is σ = 1687098864. Its totient is φ = 1686934536.

The previous prime is 1687016687. The next prime is 1687016711. The reversal of 1687016699 is 9966107861.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (1687016687) and next prime (1687016711).

It is a cyclic number.

It is not a de Polignac number, because 1687016699 - 2¹⁶ = 1686951163 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1687016699.

It is not an unprimeable number, because it can be changed into a prime (1687016609) 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, 19274 + ... + 61200.

It is an arithmetic number, because the mean of its divisors is an integer number (421774716).

Almost surely, 2^1687016699 is an apocalyptic number.

1687016699 is a deficient number, since it is larger than the sum of its proper divisors (82165).

1687016699 is an equidigital number, since it uses as much as digits as its factorization.

1687016699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82164.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 1687016699 is about 41073.3088391963. The cubic root of 1687016699 is about 1190.4371199733.

The spelling of 1687016699 in words is "one billion, six hundred eighty-seven million, sixteen thousand, six hundred ninety-nine".