55666515 has 32 divisors (see below), whose sum is σ = 93453120. Its totient is φ = 28256256.

The previous prime is 55666511. The next prime is 55666519. The reversal of 55666515 is 51566655.

It is an interprime number because it is at equal distance from previous prime (55666511) and next prime (55666519).

It is not a de Polignac number, because 55666515 - 2² = 55666511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55666511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30879 + ... + 32631.

It is an arithmetic number, because the mean of its divisors is an integer number (2920410).

Almost surely, 2^55666515 is an apocalyptic number.

55666515 is a deficient number, since it is larger than the sum of its proper divisors (37786605).

55666515 is a wasteful number, since it uses less digits than its factorization.

55666515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863.

The product of its digits is 135000, while the sum is 39.

The square root of 55666515 is about 7460.9995979091. Note that the first 3 decimals coincide. The cubic root of 55666515 is about 381.8252789600.

The spelling of 55666515 in words is "fifty-five million, six hundred sixty-six thousand, five hundred fifteen".