19691052780 has 576 divisors, whose sum is σ = 70077934080. Its totient is φ = 4109414400.

The previous prime is 19691052779. The next prime is 19691052793. The reversal of 19691052780 is 8725019691.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 150313315 + ... + 150313445.

It is an arithmetic number, because the mean of its divisors is an integer number (121663080).

Almost surely, 2^19691052780 is an apocalyptic number.

19691052780 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 19691052780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35038967040).

19691052780 is an abundant number, since it is smaller than the sum of its proper divisors (50386881300).

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

19691052780 is a wasteful number, since it uses less digits than its factorization.

19691052780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 48.

The spelling of 19691052780 in words is "nineteen billion, six hundred ninety-one million, fifty-two thousand, seven hundred eighty".