18386070649 has 2 divisors, whose sum is σ = 18386070650. Its totient is φ = 18386070648.

The previous prime is 18386070587. The next prime is 18386070683. The reversal of 18386070649 is 94607068381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18206644624 + 179426025 = 134932^2 + 13395^2 .

It is a cyclic number.

It is not a de Polignac number, because 18386070649 - 2⁹ = 18386070137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18386070596 and 18386070605.

It is not a weakly prime, because it can be changed into another prime (18386070749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9193035324 + 9193035325.

It is an arithmetic number, because the mean of its divisors is an integer number (9193035325).

Almost surely, 2^18386070649 is an apocalyptic number.

It is an amenable number.

18386070649 is a deficient number, since it is larger than the sum of its proper divisors (1).

18386070649 is an equidigital number, since it uses as much as digits as its factorization.

18386070649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 18386070649 in words is "eighteen billion, three hundred eighty-six million, seventy thousand, six hundred forty-nine".