317945993690 has 16 divisors (see below), whose sum is σ = 616326080328. Its totient is φ = 117395443776.

The previous prime is 317945993669. The next prime is 317945993693. The reversal of 317945993690 is 96399549713.

It is a happy number.

It is a Cunningham number, because it is equal to 563867²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 114461099041 + 203484894649 = 338321^2 + 451093^2 .

It is a super-2 number, since 2×317945993690² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is not an unprimeable number, because it can be changed into a prime (317945993693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1222869077 + ... + 1222869336.

Almost surely, 2^317945993690 is an apocalyptic number.

317945993690 is a deficient number, since it is larger than the sum of its proper divisors (298380086638).

317945993690 is a wasteful number, since it uses less digits than its factorization.

317945993690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2445738433.

The product of its (nonzero) digits is 49601160, while the sum is 65.

The spelling of 317945993690 in words is "three hundred seventeen billion, nine hundred forty-five million, nine hundred ninety-three thousand, six hundred ninety".