10001515681 has 2 divisors, whose sum is σ = 10001515682. Its totient is φ = 10001515680.

The previous prime is 10001515639. The next prime is 10001515703. The reversal of 10001515681 is 18651510001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5039722081 + 4961793600 = 70991^2 + 70440^2 .

It is a cyclic number.

It is not a de Polignac number, because 10001515681 - 2¹⁹ = 10000991393 is a prime.

It is a super-2 number, since 2×10001515681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10001515481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000757840 + 5000757841.

It is an arithmetic number, because the mean of its divisors is an integer number (5000757841).

Almost surely, 2^10001515681 is an apocalyptic number.

It is an amenable number.

10001515681 is a deficient number, since it is larger than the sum of its proper divisors (1).

10001515681 is an equidigital number, since it uses as much as digits as its factorization.

10001515681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 28.

The spelling of 10001515681 in words is "ten billion, one million, five hundred fifteen thousand, six hundred eighty-one".