55220401 has 8 divisors (see below), whose sum is σ = 58599360. Its totient is φ = 51922992.

The previous prime is 55220383. The next prime is 55220413. The reversal of 55220401 is 10402255.

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 55220401 - 2⁷ = 55220273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55220491) 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, 18990 + ... + 21703.

It is an arithmetic number, because the mean of its divisors is an integer number (7324920).

Almost surely, 2^55220401 is an apocalyptic number.

It is an amenable number.

55220401 is a deficient number, since it is larger than the sum of its proper divisors (3378959).

55220401 is a wasteful number, since it uses less digits than its factorization.

55220401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40775.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 55220401 is about 7431.0430627201. The cubic root of 55220401 is about 380.8025535962.

Adding to 55220401 its reverse (10402255), we get a palindrome (65622656).

The spelling of 55220401 in words is "fifty-five million, two hundred twenty thousand, four hundred one".