1318985650 has 24 divisors (see below), whose sum is σ = 2455707780. Its totient is φ = 527079360.

The previous prime is 1318985639. The next prime is 1318985671. The reversal of 1318985650 is 565898131.

It can be written as a sum of positive squares in 6 ways, for example, as 706868569 + 612117081 = 26587^2 + 24741^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1318985650.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41112 + ... + 65788.

Almost surely, 2^1318985650 is an apocalyptic number.

1318985650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1318985650 is a deficient number, since it is larger than the sum of its proper divisors (1136722130).

1318985650 is a wasteful number, since it uses less digits than its factorization.

1318985650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25758 (or 25753 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 1318985650 is about 36317.8420339094. The cubic root of 1318985650 is about 1096.6802529500.

The spelling of 1318985650 in words is "one billion, three hundred eighteen million, nine hundred eighty-five thousand, six hundred fifty".