16938863890 has 16 divisors (see below), whose sum is σ = 32835336408. Its totient is φ = 6254349696.

The previous prime is 16938863839. The next prime is 16938863891. The reversal of 16938863890 is 9836883961.

It can be written as a sum of positive squares in 4 ways, for example, as 8699852529 + 8239011361 = 93273^2 + 90769^2 .

It is not an unprimeable number, because it can be changed into a prime (16938863891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65149347 + ... + 65149606.

Almost surely, 2^16938863890 is an apocalyptic number.

16938863890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16938863890 is a deficient number, since it is larger than the sum of its proper divisors (15896472518).

16938863890 is a wasteful number, since it uses less digits than its factorization.

16938863890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130298973.

The product of its (nonzero) digits is 13436928, while the sum is 61.

The spelling of 16938863890 in words is "sixteen billion, nine hundred thirty-eight million, eight hundred sixty-three thousand, eight hundred ninety".