1688700520370 has 16 divisors (see below), whose sum is σ = 3113799009048. Its totient is φ = 659005080960.

The previous prime is 1688700520363. The next prime is 1688700520379. The reversal of 1688700520370 is 730250078861.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1315102074841 + 373598445529 = 1146779^2 + 611227^2 .

It is not an unprimeable number, because it can be changed into a prime (1688700520379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2059390469 + ... + 2059391288.

Almost surely, 2^{1688700520370} is an apocalyptic number.

1688700520370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1688700520370 is a deficient number, since it is larger than the sum of its proper divisors (1425098488678).

1688700520370 is a wasteful number, since it uses less digits than its factorization.

1688700520370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4118781805.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 1688700520370 in words is "one trillion, six hundred eighty-eight billion, seven hundred million, five hundred twenty thousand, three hundred seventy".