2266400778849 has 45 divisors (see below), whose sum is σ = 3460150186977. Its totient is φ = 1478370817656.

The previous prime is 2266400778821. The next prime is 2266400778853. The reversal of 2266400778849 is 9488770046622.

The square root of 2266400778849 is 1505457.

It is a perfect power (a square), and thus also a powerful number.

2266400778849 is a `hidden beast` number, since 22 + 66 + 400 + 7 + 78 + 84 + 9 = 666.

It is not a de Polignac number, because 2266400778849 - 2³¹ = 2264253295201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2266400774849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 636806532 + ... + 636810090.

Almost surely, 2^{2266400778849} is an apocalyptic number.

2266400778849 is the 1505457-th square number.

2266400778849 is the 752729-th centered octagonal number.

It is an amenable number.

2266400778849 is a deficient number, since it is larger than the sum of its proper divisors (1193749408128).

2266400778849 is an frugal number, since it uses more digits than its factorization.

2266400778849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7224 (or 3609 counting only the distinct ones).

The product of its (nonzero) digits is 65028096, while the sum is 63.

The spelling of 2266400778849 in words is "two trillion, two hundred sixty-six billion, four hundred million, seven hundred seventy-eight thousand, eight hundred forty-nine".