15666097638 has 32 divisors (see below), whose sum is σ = 31472267904. Its totient is φ = 5198729472.

The previous prime is 15666097637. The next prime is 15666097717. The reversal of 15666097638 is 83679066651.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15666097631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1666006 + ... + 1675382.

It is an arithmetic number, because the mean of its divisors is an integer number (983508372).

Almost surely, 2^15666097638 is an apocalyptic number.

15666097638 is an abundant number, since it is smaller than the sum of its proper divisors (15806170266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15666097638 is a wasteful number, since it uses less digits than its factorization.

15666097638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10596.

The product of its (nonzero) digits is 9797760, while the sum is 57.

The spelling of 15666097638 in words is "fifteen billion, six hundred sixty-six million, ninety-seven thousand, six hundred thirty-eight".