897705903645 has 18 divisors (see below), whose sum is σ = 1556034583194. Its totient is φ = 478773092160.

The previous prime is 897705903631. The next prime is 897705903671. The reversal of 897705903645 is 546309507798.

897705903645 is a `hidden beast` number, since 8 + 9 + 7 + 7 + 0 + 590 + 36 + 4 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 449819710596 + 447886193049 = 670686^2 + 669243^2 .

It is not a de Polignac number, because 897705903645 - 2⁸ = 897705903389 is a prime.

It is a super-4 number, since 4×897705903645⁴ (a number of 49 digits) contains 4444 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6285225 + ... + 6426465.

It is an arithmetic number, because the mean of its divisors is an integer number (86446365733).

Almost surely, 2^897705903645 is an apocalyptic number.

It is an amenable number.

897705903645 is a deficient number, since it is larger than the sum of its proper divisors (658328679549).

897705903645 is an frugal number, since it uses more digits than its factorization.

897705903645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282493 (or 141249 counting only the distinct ones).

The product of its (nonzero) digits is 57153600, while the sum is 63.

The spelling of 897705903645 in words is "eight hundred ninety-seven billion, seven hundred five million, nine hundred three thousand, six hundred forty-five".