15665655249481 has 2 divisors, whose sum is σ = 15665655249482. Its totient is φ = 15665655249480.

The previous prime is 15665655249479. The next prime is 15665655249533. The reversal of 15665655249481 is 18494255656651.

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., 9175695197881 + 6489960051600 = 3029141^2 + 2547540^2 .

It is a cyclic number.

It is not a de Polignac number, because 15665655249481 - 2¹ = 15665655249479 is a prime.

It is a super-2 number, since 2×15665655249481² (a number of 27 digits) contains 22 as substring.

Together with 15665655249479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15665655249401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7832827624740 + 7832827624741.

It is an arithmetic number, because the mean of its divisors is an integer number (7832827624741).

Almost surely, 2^{15665655249481} is an apocalyptic number.

It is an amenable number.

15665655249481 is a deficient number, since it is larger than the sum of its proper divisors (1).

15665655249481 is an equidigital number, since it uses as much as digits as its factorization.

15665655249481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040000, while the sum is 67.

The spelling of 15665655249481 in words is "fifteen trillion, six hundred sixty-five billion, six hundred fifty-five million, two hundred forty-nine thousand, four hundred eighty-one".