19440968685 has 16 divisors (see below), whose sum is σ = 31156809216. Its totient is φ = 10351430208.

The previous prime is 19440968633. The next prime is 19440968747. The reversal of 19440968685 is 58686904491.

It is not a de Polignac number, because 19440968685 - 2⁶ = 19440968621 is a prime.

It is a super-2 number, since 2×19440968685² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1058494 + ... + 1076703.

It is an arithmetic number, because the mean of its divisors is an integer number (1947300576).

Almost surely, 2^19440968685 is an apocalyptic number.

19440968685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19440968685 is a deficient number, since it is larger than the sum of its proper divisors (11715840531).

19440968685 is a wasteful number, since it uses less digits than its factorization.

19440968685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135812.

The product of its (nonzero) digits is 14929920, while the sum is 60.

The spelling of 19440968685 in words is "nineteen billion, four hundred forty million, nine hundred sixty-eight thousand, six hundred eighty-five".