55685015 has 4 divisors (see below), whose sum is σ = 66822024. Its totient is φ = 44548008.

The previous prime is 55684999. The next prime is 55685023. The reversal of 55685015 is 51058655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51058655 = 5 ⋅10211731.

It is a cyclic number.

It is not a de Polignac number, because 55685015 - 2⁴ = 55684999 is a prime.

It is a Duffinian number.

It is a congruent 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, 5568497 + ... + 5568506.

It is an arithmetic number, because the mean of its divisors is an integer number (16705506).

Almost surely, 2^55685015 is an apocalyptic number.

55685015 is a deficient number, since it is larger than the sum of its proper divisors (11137009).

55685015 is a wasteful number, since it uses less digits than its factorization.

55685015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11137008.

The product of its (nonzero) digits is 30000, while the sum is 35.

The square root of 55685015 is about 7462.2392751774. The cubic root of 55685015 is about 381.8675724003.

The spelling of 55685015 in words is "fifty-five million, six hundred eighty-five thousand, fifteen".