55500051 has 4 divisors (see below), whose sum is σ = 74000072. Its totient is φ = 37000032.

The previous prime is 55500047. The next prime is 55500077. The reversal of 55500051 is 15000555.

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

It is not a de Polignac number, because 55500051 - 2² = 55500047 is a prime.

It is a super-2 number, since 2×55500051² = 6160511322005202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55500031) 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, 9250006 + ... + 9250011.

It is an arithmetic number, because the mean of its divisors is an integer number (18500018).

Almost surely, 2^55500051 is an apocalyptic number.

55500051 is a deficient number, since it is larger than the sum of its proper divisors (18500021).

55500051 is a wasteful number, since it uses less digits than its factorization.

55500051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18500020.

The product of its (nonzero) digits is 625, while the sum is 21.

The square root of 55500051 is about 7449.8356357708. The cubic root of 55500051 is about 381.4442981314. Note that the first 3 decimals are identical.

The spelling of 55500051 in words is "fifty-five million, five hundred thousand, fifty-one".