1778918055 has 16 divisors (see below), whose sum is σ = 2854479744. Its totient is φ = 946019360.

The previous prime is 1778918039. The next prime is 1778918059. The reversal of 1778918055 is 5508198771.

It is not a de Polignac number, because 1778918055 - 2⁴ = 1778918039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1778917989 and 1778918007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1778918059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165681 + ... + 176090.

It is an arithmetic number, because the mean of its divisors is an integer number (178404984).

Almost surely, 2^1778918055 is an apocalyptic number.

1778918055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1778918055 is a deficient number, since it is larger than the sum of its proper divisors (1075561689).

1778918055 is a wasteful number, since it uses less digits than its factorization.

1778918055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342126.

The product of its (nonzero) digits is 705600, while the sum is 51.

The square root of 1778918055 is about 42177.2219924452. The cubic root of 1778918055 is about 1211.6726758520.

The spelling of 1778918055 in words is "one billion, seven hundred seventy-eight million, nine hundred eighteen thousand, fifty-five".