15000537945581 has 2 divisors, whose sum is σ = 15000537945582. Its totient is φ = 15000537945580.

The previous prime is 15000537945521. The next prime is 15000537945593. The reversal of 15000537945581 is 18554973500051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8548074316681 + 6452463628900 = 2923709^2 + 2540170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15000537945581 is a prime.

It is a super-2 number, since 2×15000537945581² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15000537945521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7500268972790 + 7500268972791.

It is an arithmetic number, because the mean of its divisors is an integer number (7500268972791).

Almost surely, 2^{15000537945581} is an apocalyptic number.

It is an amenable number.

15000537945581 is a deficient number, since it is larger than the sum of its proper divisors (1).

15000537945581 is an equidigital number, since it uses as much as digits as its factorization.

15000537945581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780000, while the sum is 53.

The spelling of 15000537945581 in words is "fifteen trillion, five hundred thirty-seven million, nine hundred forty-five thousand, five hundred eighty-one".