55177819 has 4 divisors (see below), whose sum is σ = 55842696. Its totient is φ = 54512944.

The previous prime is 55177769. The next prime is 55177877. The reversal of 55177819 is 91877155.

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

It is a cyclic number.

It is not a de Polignac number, because 55177819 - 2¹⁹ = 54653531 is a prime.

It is a super-2 number, since 2×55177819² = 6089183419193522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55177879) 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, 332314 + ... + 332479.

It is an arithmetic number, because the mean of its divisors is an integer number (13960674).

Almost surely, 2^55177819 is an apocalyptic number.

55177819 is a deficient number, since it is larger than the sum of its proper divisors (664877).

55177819 is an equidigital number, since it uses as much as digits as its factorization.

55177819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664876.

The product of its digits is 88200, while the sum is 43.

The square root of 55177819 is about 7428.1773672954. The cubic root of 55177819 is about 380.7046459156.

The spelling of 55177819 in words is "fifty-five million, one hundred seventy-seven thousand, eight hundred nineteen".