15661001610015 has 32 divisors (see below), whose sum is σ = 25500955963392. Its totient is φ = 8205587040000.

The previous prime is 15661001609993. The next prime is 15661001610019. The reversal of 15661001610015 is 51001610016651.

It is not a de Polignac number, because 15661001610015 - 2²⁰ = 15661000561439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15661001610019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25866511 + ... + 26465040.

It is an arithmetic number, because the mean of its divisors is an integer number (796904873856).

Almost surely, 2^{15661001610015} is an apocalyptic number.

15661001610015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15661001610015 is a deficient number, since it is larger than the sum of its proper divisors (9839954353377).

15661001610015 is a wasteful number, since it uses less digits than its factorization.

15661001610015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52331911.

The product of its (nonzero) digits is 5400, while the sum is 33.

Adding to 15661001610015 its reverse (51001610016651), we get a palindrome (66662611626666).

The spelling of 15661001610015 in words is "fifteen trillion, six hundred sixty-one billion, one million, six hundred ten thousand, fifteen".