19989029650 has 12 divisors (see below), whose sum is σ = 37179595242. Its totient is φ = 7995611840.

The previous prime is 19989029639. The next prime is 19989029651. The reversal of 19989029650 is 5692098991.

It can be written as a sum of positive squares in 3 ways, for example, as 18654369561 + 1334660089 = 136581^2 + 36533^2 .

It is a super-2 number, since 2×19989029650² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19989029651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 199890247 + ... + 199890346.

Almost surely, 2^19989029650 is an apocalyptic number.

19989029650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19989029650 is a deficient number, since it is larger than the sum of its proper divisors (17190565592).

19989029650 is a wasteful number, since it uses less digits than its factorization.

19989029650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399780605 (or 399780600 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 58.

The spelling of 19989029650 in words is "nineteen billion, nine hundred eighty-nine million, twenty-nine thousand, six hundred fifty".