15551740081 has 2 divisors, whose sum is σ = 15551740082. Its totient is φ = 15551740080.

The previous prime is 15551740067. The next prime is 15551740163. The reversal of 15551740081 is 18004715551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15231509056 + 320231025 = 123416^2 + 17895^2 .

It is a cyclic number.

It is not a de Polignac number, because 15551740081 - 2⁹ = 15551739569 is a prime.

It is a super-2 number, since 2×15551740081² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15551740081.

It is not a weakly prime, because it can be changed into another prime (15551740481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7775870040 + 7775870041.

It is an arithmetic number, because the mean of its divisors is an integer number (7775870041).

Almost surely, 2^15551740081 is an apocalyptic number.

It is an amenable number.

15551740081 is a deficient number, since it is larger than the sum of its proper divisors (1).

15551740081 is an equidigital number, since it uses as much as digits as its factorization.

15551740081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28000, while the sum is 37.

The spelling of 15551740081 in words is "fifteen billion, five hundred fifty-one million, seven hundred forty thousand, eighty-one".