15551660101 has 2 divisors, whose sum is σ = 15551660102. Its totient is φ = 15551660100.

The previous prime is 15551660099. The next prime is 15551660107. The reversal of 15551660101 is 10106615551.

15551660101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8373165025 + 7178495076 = 91505^2 + 84726^2 .

It is an emirp because it is prime and its reverse (10106615551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15551660101 - 2¹ = 15551660099 is a prime.

Together with 15551660099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15551660107) by changing a digit.

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 as a sum of consecutive naturals, namely, 7775830050 + 7775830051.

It is an arithmetic number, because the mean of its divisors is an integer number (7775830051).

Almost surely, 2^15551660101 is an apocalyptic number.

It is an amenable number.

15551660101 is a deficient number, since it is larger than the sum of its proper divisors (1).

15551660101 is an equidigital number, since it uses as much as digits as its factorization.

15551660101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 15551660101 in words is "fifteen billion, five hundred fifty-one million, six hundred sixty thousand, one hundred one".