685764253 has 4 divisors (see below), whose sum is σ = 704298460. Its totient is φ = 667230048.

The previous prime is 685764227. The next prime is 685764269. The reversal of 685764253 is 352467586.

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 547419609 + 138344644 = 23397^2 + 11762^2 .

It is a cyclic number.

It is not a de Polignac number, because 685764253 - 2¹⁷ = 685633181 is a prime.

It is a super-2 number, since 2×685764253² = 940545221385296018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685764203) 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, 9267048 + ... + 9267121.

It is an arithmetic number, because the mean of its divisors is an integer number (176074615).

Almost surely, 2^685764253 is an apocalyptic number.

It is an amenable number.

685764253 is a deficient number, since it is larger than the sum of its proper divisors (18534207).

685764253 is a wasteful number, since it uses less digits than its factorization.

685764253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18534206.

The product of its digits is 1209600, while the sum is 46.

The square root of 685764253 is about 26187.1008895601. The cubic root of 685764253 is about 881.8436952534.

The spelling of 685764253 in words is "six hundred eighty-five million, seven hundred sixty-four thousand, two hundred fifty-three".