685701601 has 4 divisors (see below), whose sum is σ = 738447892. Its totient is φ = 632955312.

The previous prime is 685701571. The next prime is 685701619. The reversal of 685701601 is 106107586.

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 348942400 + 336759201 = 18680^2 + 18351^2 .

It is a cyclic number.

It is not a de Polignac number, because 685701601 - 2⁷ = 685701473 is a prime.

It is a super-2 number, since 2×685701601² = 940373371227926402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (685701641) 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, 26373126 + ... + 26373151.

It is an arithmetic number, because the mean of its divisors is an integer number (184611973).

Almost surely, 2^685701601 is an apocalyptic number.

It is an amenable number.

685701601 is a deficient number, since it is larger than the sum of its proper divisors (52746291).

685701601 is a wasteful number, since it uses less digits than its factorization.

685701601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52746290.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 685701601 is about 26185.9046244349. The cubic root of 685701601 is about 881.8168391078.

The spelling of 685701601 in words is "six hundred eighty-five million, seven hundred one thousand, six hundred one".