718163649 has 18 divisors (see below), whose sum is σ = 1206711090. Its totient is φ = 410378976.

The previous prime is 718163647. The next prime is 718163659. The reversal of 718163649 is 946361817.

It is a happy number.

718163649 is a `hidden beast` number, since 7 + 1 + 8 + 1 + 636 + 4 + 9 = 666.

718163649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 502073649 + 216090000 = 22407^2 + 14700^2 .

It is not a de Polignac number, because 718163649 - 2¹ = 718163647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (718163647) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 813804 + ... + 814685.

It is an arithmetic number, because the mean of its divisors is an integer number (67039505).

Almost surely, 2^718163649 is an apocalyptic number.

It is an amenable number.

718163649 is a deficient number, since it is larger than the sum of its proper divisors (488547441).

718163649 is a wasteful number, since it uses less digits than its factorization.

718163649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628509 (or 1628499 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 718163649 is about 26798.5755031867. The cubic root of 718163649 is about 895.5183161288.

The spelling of 718163649 in words is "seven hundred eighteen million, one hundred sixty-three thousand, six hundred forty-nine".