315663099581 has 2 divisors, whose sum is σ = 315663099582. Its totient is φ = 315663099580.

The previous prime is 315663099569. The next prime is 315663099611. The reversal of 315663099581 is 185990366513.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311994859225 + 3668240356 = 558565^2 + 60566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315663099581 is a prime.

It is a super-2 number, since 2×315663099581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315663099281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157831549790 + 157831549791.

It is an arithmetic number, because the mean of its divisors is an integer number (157831549791).

Almost surely, 2^315663099581 is an apocalyptic number.

It is an amenable number.

315663099581 is a deficient number, since it is larger than the sum of its proper divisors (1).

315663099581 is an equidigital number, since it uses as much as digits as its factorization.

315663099581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5248800, while the sum is 56.

The spelling of 315663099581 in words is "three hundred fifteen billion, six hundred sixty-three million, ninety-nine thousand, five hundred eighty-one".