15664405611361 has 4 divisors (see below), whose sum is σ = 16869359889172. Its totient is φ = 14459451333552.

The previous prime is 15664405611341. The next prime is 15664405611373. The reversal of 15664405611361 is 16311650446651.

It is a happy number.

15664405611361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6024349347025 + 9640056264336 = 2454455^2 + 3104844^2 .

It is a cyclic number.

It is not a de Polignac number, because 15664405611361 - 2¹¹ = 15664405609313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15664405611301) 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, 602477138886 + ... + 602477138911.

It is an arithmetic number, because the mean of its divisors is an integer number (4217339972293).

Almost surely, 2^{15664405611361} is an apocalyptic number.

It is an amenable number.

15664405611361 is a deficient number, since it is larger than the sum of its proper divisors (1204954277811).

15664405611361 is a wasteful number, since it uses less digits than its factorization.

15664405611361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204954277810.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 15664405611361 in words is "fifteen trillion, six hundred sixty-four billion, four hundred five million, six hundred eleven thousand, three hundred sixty-one".