2278747657 has 2 divisors, whose sum is σ = 2278747658. Its totient is φ = 2278747656.

The previous prime is 2278747621. The next prime is 2278747663. The reversal of 2278747657 is 7567478722.

2278747657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2106718201 + 172029456 = 45899^2 + 13116^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278747657 - 2²⁷ = 2144529929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2278747598 and 2278747607.

It is not a weakly prime, because it can be changed into another prime (2278747697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139373828 + 1139373829.

It is an arithmetic number, because the mean of its divisors is an integer number (1139373829).

Almost surely, 2^2278747657 is an apocalyptic number.

It is an amenable number.

2278747657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278747657 is an equidigital number, since it uses as much as digits as its factorization.

2278747657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9219840, while the sum is 55.

The square root of 2278747657 is about 47736.2300250030. The cubic root of 2278747657 is about 1315.9278501309.

The spelling of 2278747657 in words is "two billion, two hundred seventy-eight million, seven hundred forty-seven thousand, six hundred fifty-seven".