15616066551121 has 4 divisors (see below), whose sum is σ = 16038122403892. Its totient is φ = 15194010698352.

The previous prime is 15616066551073. The next prime is 15616066551179. The reversal of 15616066551121 is 12115566061651.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11333732966721 + 4282333584400 = 3366561^2 + 2069380^2 .

It is a cyclic number.

It is not a de Polignac number, because 15616066551121 - 2¹¹ = 15616066549073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15616066551191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211027926330 + ... + 211027926403.

It is an arithmetic number, because the mean of its divisors is an integer number (4009530600973).

Almost surely, 2^{15616066551121} is an apocalyptic number.

It is an amenable number.

15616066551121 is a deficient number, since it is larger than the sum of its proper divisors (422055852771).

15616066551121 is an equidigital number, since it uses as much as digits as its factorization.

15616066551121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422055852770.

The product of its (nonzero) digits is 324000, while the sum is 46.

The spelling of 15616066551121 in words is "fifteen trillion, six hundred sixteen billion, sixty-six million, five hundred fifty-one thousand, one hundred twenty-one".