55511515 has 4 divisors (see below), whose sum is σ = 66613824. Its totient is φ = 44409208.

The previous prime is 55511509. The next prime is 55511537. The reversal of 55511515 is 51511555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55511515 - 2⁹ = 55511003 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5551147 + ... + 5551156.

It is an arithmetic number, because the mean of its divisors is an integer number (16653456).

Almost surely, 2^55511515 is an apocalyptic number.

55511515 is a deficient number, since it is larger than the sum of its proper divisors (11102309).

55511515 is a wasteful number, since it uses less digits than its factorization.

55511515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11102308.

The product of its digits is 3125, while the sum is 28.

The square root of 55511515 is about 7450.6050089909. The cubic root of 55511515 is about 381.4705598273.

The spelling of 55511515 in words is "fifty-five million, five hundred eleven thousand, five hundred fifteen".