55651813 has 8 divisors (see below), whose sum is σ = 64088640. Its totient is φ = 47336640.

The previous prime is 55651777. The next prime is 55651819. The reversal of 55651813 is 31815655.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55651813 - 2⁹ = 55651301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55651819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29428 + ... + 31261.

It is an arithmetic number, because the mean of its divisors is an integer number (8011080).

Almost surely, 2^55651813 is an apocalyptic number.

It is an amenable number.

55651813 is a deficient number, since it is larger than the sum of its proper divisors (8436827).

55651813 is a wasteful number, since it uses less digits than its factorization.

55651813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60827.

The product of its digits is 18000, while the sum is 34.

The square root of 55651813 is about 7460.0142761258. The cubic root of 55651813 is about 381.7916615659.

The spelling of 55651813 in words is "fifty-five million, six hundred fifty-one thousand, eight hundred thirteen".