15666391442930 has 8 divisors (see below), whose sum is σ = 28199504597292. Its totient is φ = 6266556577168.

The previous prime is 15666391442899. The next prime is 15666391442939. The reversal of 15666391442930 is 3924419366651.

It can be written as a sum of positive squares in 2 ways, for example, as 15666310208761 + 81234169 = 3958069^2 + 9013^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×15666391442930² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15666391442930.

It is not an unprimeable number, because it can be changed into a prime (15666391442939) 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, 783319572137 + ... + 783319572156.

Almost surely, 2^{15666391442930} is an apocalyptic number.

15666391442930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15666391442930 is a deficient number, since it is larger than the sum of its proper divisors (12533113154362).

15666391442930 is a wasteful number, since it uses less digits than its factorization.

15666391442930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566639144300.

The product of its (nonzero) digits is 25194240, while the sum is 59.

The spelling of 15666391442930 in words is "fifteen trillion, six hundred sixty-six billion, three hundred ninety-one million, four hundred forty-two thousand, nine hundred thirty".