15556665151 has 4 divisors (see below), whose sum is σ = 15557031072. Its totient is φ = 15556299232.

The previous prime is 15556665149. The next prime is 15556665253. The reversal of 15556665151 is 15156665551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15156665551 = 509 ⋅29777339.

It is a cyclic number.

It is not a de Polignac number, because 15556665151 - 2¹ = 15556665149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15556665851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109306 + ... + 207511.

It is an arithmetic number, because the mean of its divisors is an integer number (3889257768).

Almost surely, 2^15556665151 is an apocalyptic number.

15556665151 is a deficient number, since it is larger than the sum of its proper divisors (365921).

15556665151 is an equidigital number, since it uses as much as digits as its factorization.

15556665151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365920.

The product of its digits is 675000, while the sum is 46.

The spelling of 15556665151 in words is "fifteen billion, five hundred fifty-six million, six hundred sixty-five thousand, one hundred fifty-one".