55220007 has 4 divisors (see below), whose sum is σ = 73626680. Its totient is φ = 36813336.

The previous prime is 55220003. The next prime is 55220059. The reversal of 55220007 is 70002255.

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

It is not a de Polignac number, because 55220007 - 2² = 55220003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55220003) 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, 9203332 + ... + 9203337.

It is an arithmetic number, because the mean of its divisors is an integer number (18406670).

Almost surely, 2^55220007 is an apocalyptic number.

55220007 is a deficient number, since it is larger than the sum of its proper divisors (18406673).

55220007 is a wasteful number, since it uses less digits than its factorization.

55220007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18406672.

The product of its (nonzero) digits is 700, while the sum is 21.

The square root of 55220007 is about 7431.0165522626. The cubic root of 55220007 is about 380.8016479131.

The spelling of 55220007 in words is "fifty-five million, two hundred twenty thousand, seven".