19951013280 has 384 divisors, whose sum is σ = 73302921216. Its totient is φ = 4512358400.

The previous prime is 19951013273. The next prime is 19951013281. The reversal of 19951013280 is 8231015991.

It is not an unprimeable number, because it can be changed into a prime (19951013281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4977037 + ... + 4981043.

It is an arithmetic number, because the mean of its divisors is an integer number (190893024).

Almost surely, 2^19951013280 is an apocalyptic number.

19951013280 is a gapful number since it is divisible by the number (10) 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 19951013280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36651460608).

19951013280 is an abundant number, since it is smaller than the sum of its proper divisors (53351907936).

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

19951013280 is a wasteful number, since it uses less digits than its factorization.

19951013280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4100 (or 4092 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 39.

The spelling of 19951013280 in words is "nineteen billion, nine hundred fifty-one million, thirteen thousand, two hundred eighty".