2245477778 has 4 divisors (see below), whose sum is σ = 3368216670. Its totient is φ = 1122738888.

The previous prime is 2245477763. The next prime is 2245477799. The reversal of 2245477778 is 8777745422.

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

It can be written as a sum of positive squares in only one way, i.e., 1598640289 + 646837489 = 39983^2 + 25433^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561369443 + ... + 561369446.

Almost surely, 2^2245477778 is an apocalyptic number.

2245477778 is a deficient number, since it is larger than the sum of its proper divisors (1122738892).

2245477778 is a wasteful number, since it uses less digits than its factorization.

2245477778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122738891.

The product of its digits is 6146560, while the sum is 53.

The square root of 2245477778 is about 47386.4725211742. The cubic root of 2245477778 is about 1309.4922138945.

The spelling of 2245477778 in words is "two billion, two hundred forty-five million, four hundred seventy-seven thousand, seven hundred seventy-eight".