15666097698 has 12 divisors (see below), whose sum is σ = 33943211718. Its totient is φ = 5222032560.

The previous prime is 15666097637. The next prime is 15666097717. The reversal of 15666097698 is 89679066651.

15666097698 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 14456936169 + 1209161529 = 120237^2 + 34773^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 435169363 + ... + 435169398.

Almost surely, 2^15666097698 is an apocalyptic number.

15666097698 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

15666097698 is an abundant number, since it is smaller than the sum of its proper divisors (18277114020).

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

15666097698 is a wasteful number, since it uses less digits than its factorization.

15666097698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870338769 (or 870338766 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 63.

The spelling of 15666097698 in words is "fifteen billion, six hundred sixty-six million, ninety-seven thousand, six hundred ninety-eight".