19998769965 has 16 divisors (see below), whose sum is σ = 32041348800. Its totient is φ = 10651571712.

The previous prime is 19998769943. The next prime is 19998769991. The reversal of 19998769965 is 56996789991.

It is not a de Polignac number, because 19998769965 - 2⁸ = 19998769709 is a prime.

It is a super-2 number, since 2×19998769965² (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, 890980 + ... + 913149.

It is an arithmetic number, because the mean of its divisors is an integer number (2002584300).

Almost surely, 2^19998769965 is an apocalyptic number.

19998769965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19998769965 is a deficient number, since it is larger than the sum of its proper divisors (12042578835).

19998769965 is a wasteful number, since it uses less digits than its factorization.

19998769965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804876.

The product of its digits is 595213920, while the sum is 78.

The spelling of 19998769965 in words is "nineteen billion, nine hundred ninety-eight million, seven hundred sixty-nine thousand, nine hundred sixty-five".