15551511066 has 48 divisors (see below), whose sum is σ = 41470700544. Its totient is φ = 4101496992.

The previous prime is 15551511037. The next prime is 15551511067. The reversal of 15551511066 is 66011515551.

It is a happy number.

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 15551511066.

It is not an unprimeable number, because it can be changed into a prime (15551511067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4745466 + ... + 4748741.

It is an arithmetic number, because the mean of its divisors is an integer number (863972928).

Almost surely, 2^15551511066 is an apocalyptic number.

15551511066 is an abundant number, since it is smaller than the sum of its proper divisors (25919189478).

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

15551511066 is a wasteful number, since it uses less digits than its factorization.

15551511066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9494235 (or 9494232 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 15551511066 in words is "fifteen billion, five hundred fifty-one million, five hundred eleven thousand, sixty-six".