15940944515009 has 2 divisors, whose sum is σ = 15940944515010. Its totient is φ = 15940944515008.

The previous prime is 15940944514987. The next prime is 15940944515033. The reversal of 15940944515009 is 90051544904951.

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., 14050052755600 + 1890891759409 = 3748340^2 + 1375097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15940944515009 is a prime.

It is a super-2 number, since 2×15940944515009² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15940344515009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7970472257504 + 7970472257505.

It is an arithmetic number, because the mean of its divisors is an integer number (7970472257505).

Almost surely, 2^{15940944515009} is an apocalyptic number.

It is an amenable number.

15940944515009 is a deficient number, since it is larger than the sum of its proper divisors (1).

15940944515009 is an equidigital number, since it uses as much as digits as its factorization.

15940944515009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832000, while the sum is 56.

The spelling of 15940944515009 in words is "fifteen trillion, nine hundred forty billion, nine hundred forty-four million, five hundred fifteen thousand, nine".