685145751 has 8 divisors (see below), whose sum is σ = 916466304. Its totient is φ = 455294520.

The previous prime is 685145737. The next prime is 685145753. The reversal of 685145751 is 157541586.

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

It is not a de Polignac number, because 685145751 - 2⁷ = 685145623 is a prime.

It is a super-2 number, since 2×685145751² = 938849400226708002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685145753) 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, 366241 + ... + 368106.

It is an arithmetic number, because the mean of its divisors is an integer number (114558288).

Almost surely, 2^685145751 is an apocalyptic number.

685145751 is a deficient number, since it is larger than the sum of its proper divisors (231320553).

685145751 is a wasteful number, since it uses less digits than its factorization.

685145751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734661.

The product of its digits is 168000, while the sum is 42.

The square root of 685145751 is about 26175.2889382333. The cubic root of 685145751 is about 881.5784990901.

The spelling of 685145751 in words is "six hundred eighty-five million, one hundred forty-five thousand, seven hundred fifty-one".