1688998861 has 8 divisors (see below), whose sum is σ = 1860788448. Its totient is φ = 1520250000.

The previous prime is 1688998853. The next prime is 1688998867.

1688998861 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1688998861 - 2³ = 1688998853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1688998793 and 1688998802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688998867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 759015 + ... + 761236.

It is an arithmetic number, because the mean of its divisors is an integer number (232598556).

Almost surely, 2^1688998861 is an apocalyptic number.

1688998861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1688998861 is a deficient number, since it is larger than the sum of its proper divisors (171789587).

1688998861 is a wasteful number, since it uses less digits than its factorization.

1688998861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520363.

The product of its digits is 11943936, while the sum is 64.

The square root of 1688998861 is about 41097.4313187576. The cubic root of 1688998861 is about 1190.9031725962.

The spelling of 1688998861 in words is "one billion, six hundred eighty-eight million, nine hundred ninety-eight thousand, eight hundred sixty-one".