55666553515 has 16 divisors (see below), whose sum is σ = 68439107520. Its totient is φ = 43453347840.

The previous prime is 55666553491. The next prime is 55666553521. The reversal of 55666553515 is 51535566655.

It is not a de Polignac number, because 55666553515 - 2¹³ = 55666545323 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 773850 + ... + 842719.

It is an arithmetic number, because the mean of its divisors is an integer number (4277444220).

Almost surely, 2^55666553515 is an apocalyptic number.

55666553515 is a deficient number, since it is larger than the sum of its proper divisors (12772554005).

55666553515 is a wasteful number, since it uses less digits than its factorization.

55666553515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616742.

The product of its digits is 10125000, while the sum is 52.

The spelling of 55666553515 in words is "fifty-five billion, six hundred sixty-six million, five hundred fifty-three thousand, five hundred fifteen".