2366278921 has 2 divisors, whose sum is σ = 2366278922. Its totient is φ = 2366278920.

The previous prime is 2366278913. The next prime is 2366278963. The reversal of 2366278921 is 1298726632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1956823696 + 409455225 = 44236^2 + 20235^2 .

It is a cyclic number.

It is not a de Polignac number, because 2366278921 - 2³ = 2366278913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2366278991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1183139460 + 1183139461.

It is an arithmetic number, because the mean of its divisors is an integer number (1183139461).

Almost surely, 2^2366278921 is an apocalyptic number.

It is an amenable number.

2366278921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2366278921 is an equidigital number, since it uses as much as digits as its factorization.

2366278921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 46.

The square root of 2366278921 is about 48644.4130502157. The cubic root of 2366278921 is about 1332.5657447670.

The spelling of 2366278921 in words is "two billion, three hundred sixty-six million, two hundred seventy-eight thousand, nine hundred twenty-one".