19950278656 has 432 divisors, whose sum is σ = 53644368960. Its totient is φ = 7380172800.

The previous prime is 19950278653. The next prime is 19950278657. The reversal of 19950278656 is 65687205991.

It is a self number, because there is not a number n which added to its sum of digits gives 19950278656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19950278653) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 376420326 + ... + 376420378.

It is an arithmetic number, because the mean of its divisors is an integer number (124176780).

Almost surely, 2^19950278656 is an apocalyptic number.

19950278656 is a gapful number since it is divisible by the number (16) 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 19950278656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26822184480).

19950278656 is an abundant number, since it is smaller than the sum of its proper divisors (33694090304).

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

19950278656 is a wasteful number, since it uses less digits than its factorization.

19950278656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 58.

The spelling of 19950278656 in words is "nineteen billion, nine hundred fifty million, two hundred seventy-eight thousand, six hundred fifty-six".