2245691345778 has 48 divisors (see below), whose sum is σ = 4958009685720. Its totient is φ = 734359921152.

The previous prime is 2245691345713. The next prime is 2245691345839. The reversal of 2245691345778 is 8775431965422.

It is a happy number.

2245691345778 is a `hidden beast` number, since 2 + 2 + 4 + 56 + 9 + 1 + 3 + 4 + 577 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1702547403489 + 543143942289 = 1304817^2 + 736983^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8971018 + ... + 9217946.

Almost surely, 2^{2245691345778} is an apocalyptic number.

2245691345778 is an abundant number, since it is smaller than the sum of its proper divisors (2712318339942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2245691345778 is a wasteful number, since it uses less digits than its factorization.

2245691345778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256523 (or 256520 counting only the distinct ones).

The product of its digits is 101606400, while the sum is 63.

The spelling of 2245691345778 in words is "two trillion, two hundred forty-five billion, six hundred ninety-one million, three hundred forty-five thousand, seven hundred seventy-eight".