55155515 has 16 divisors (see below), whose sum is σ = 67644288. Its totient is φ = 43163136.

The previous prime is 55155511. The next prime is 55155517. The reversal of 55155515 is 51555155.

It is a cyclic number.

It is not a de Polignac number, because 55155515 - 2² = 55155511 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55155511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49454 + ... + 50556.

It is an arithmetic number, because the mean of its divisors is an integer number (4227768).

Almost surely, 2^55155515 is an apocalyptic number.

55155515 is a deficient number, since it is larger than the sum of its proper divisors (12488773).

55155515 is a wasteful number, since it uses less digits than its factorization.

55155515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318.

The product of its digits is 15625, while the sum is 32.

The square root of 55155515 is about 7426.6759051409. The cubic root of 55155515 is about 380.6533428078.

The spelling of 55155515 in words is "fifty-five million, one hundred fifty-five thousand, five hundred fifteen".