699845681 has 4 divisors (see below), whose sum is σ = 741013092. Its totient is φ = 658678272.

The previous prime is 699845659. The next prime is 699845737. The reversal of 699845681 is 186548996.

It is a happy number.

699845681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 615040000 + 84805681 = 24800^2 + 9209^2 .

It is a cyclic number.

It is not a de Polignac number, because 699845681 - 2¹⁴ = 699829297 is a prime.

It is a super-2 number, since 2×699845681² = 979567954428707522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (699845611) 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, 20583680 + ... + 20583713.

It is an arithmetic number, because the mean of its divisors is an integer number (185253273).

Almost surely, 2^699845681 is an apocalyptic number.

It is an amenable number.

699845681 is a deficient number, since it is larger than the sum of its proper divisors (41167411).

699845681 is a wasteful number, since it uses less digits than its factorization.

699845681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41167410.

The product of its digits is 3732480, while the sum is 56.

The square root of 699845681 is about 26454.5965949209. The cubic root of 699845681 is about 887.8387491103.

The spelling of 699845681 in words is "six hundred ninety-nine million, eight hundred forty-five thousand, six hundred eighty-one".