55685507 has 4 divisors (see below), whose sum is σ = 58106640. Its totient is φ = 53264376.

The previous prime is 55685501. The next prime is 55685521. The reversal of 55685507 is 70558655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70558655 = 5 ⋅14111731.

It is a cyclic number.

It is not a de Polignac number, because 55685507 - 2⁴ = 55685491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55685501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1210532 + ... + 1210577.

It is an arithmetic number, because the mean of its divisors is an integer number (14526660).

Almost surely, 2^55685507 is an apocalyptic number.

55685507 is a deficient number, since it is larger than the sum of its proper divisors (2421133).

55685507 is a wasteful number, since it uses less digits than its factorization.

55685507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421132.

The product of its (nonzero) digits is 210000, while the sum is 41.

The square root of 55685507 is about 7462.2722410805. The cubic root of 55685507 is about 381.8686970494.

The spelling of 55685507 in words is "fifty-five million, six hundred eighty-five thousand, five hundred seven".