15551997696 has 108 divisors (see below), whose sum is σ = 45794609952. Its totient is φ = 5073666048.

The previous prime is 15551997689. The next prime is 15551997737. The reversal of 15551997696 is 69679915551.

15551997696 is a `hidden beast` number, since 1 + 5 + 551 + 9 + 9 + 76 + 9 + 6 = 666.

15551997696 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×15551997696³ (a number of 32 digits) contains 333 as substring.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 36480 + ... + 180096.

Almost surely, 2^15551997696 is an apocalyptic number.

15551997696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15551997696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22897304976).

15551997696 is an abundant number, since it is smaller than the sum of its proper divisors (30242612256).

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

15551997696 is a wasteful number, since it uses less digits than its factorization.

15551997696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143686 (or 143669 counting only the distinct ones).

The product of its digits is 22963500, while the sum is 63.

The spelling of 15551997696 in words is "fifteen billion, five hundred fifty-one million, nine hundred ninety-seven thousand, six hundred ninety-six".