19951269912 has 192 divisors, whose sum is σ = 63941529600. Its totient is φ = 5499567360.

The previous prime is 19951269911. The next prime is 19951269931. The reversal of 19951269912 is 21996215991.

It is a super-2 number, since 2×19951269912² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19951269911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5607238 + ... + 5610794.

It is an arithmetic number, because the mean of its divisors is an integer number (333028800).

Almost surely, 2^19951269912 is an apocalyptic number.

19951269912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19951269912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31970764800).

19951269912 is an abundant number, since it is smaller than the sum of its proper divisors (43990259688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19951269912 is a wasteful number, since it uses less digits than its factorization.

19951269912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3966 (or 3959 counting only the distinct ones).

The product of its digits is 787320, while the sum is 54.

The spelling of 19951269912 in words is "nineteen billion, nine hundred fifty-one million, two hundred sixty-nine thousand, nine hundred twelve".