2278180649 has 2 divisors, whose sum is σ = 2278180650. Its totient is φ = 2278180648.

The previous prime is 2278180633. The next prime is 2278180777. The reversal of 2278180649 is 9460818722.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1886338624 + 391842025 = 43432^2 + 19795^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278180649 - 2⁴ = 2278180633 is a prime.

It is a super-2 number, since 2×2278180649² = 10380214138956122402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2278180609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139090324 + 1139090325.

It is an arithmetic number, because the mean of its divisors is an integer number (1139090325).

Almost surely, 2^2278180649 is an apocalyptic number.

It is an amenable number.

2278180649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278180649 is an equidigital number, since it uses as much as digits as its factorization.

2278180649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 2278180649 is about 47730.2906863137. The cubic root of 2278180649 is about 1315.8186960946.

The spelling of 2278180649 in words is "two billion, two hundred seventy-eight million, one hundred eighty thousand, six hundred forty-nine".