19781656360 has 32 divisors (see below), whose sum is σ = 45543817440. Its totient is φ = 7728646464.

The previous prime is 19781656319. The next prime is 19781656361. The reversal of 19781656360 is 6365618791.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19781656298 and 19781656307.

It is not an unprimeable number, because it can be changed into a prime (19781656361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5748762 + ... + 5752201.

It is an arithmetic number, because the mean of its divisors is an integer number (1423244295).

Almost surely, 2^19781656360 is an apocalyptic number.

19781656360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19781656360 is an abundant number, since it is smaller than the sum of its proper divisors (25762161080).

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

19781656360 is a wasteful number, since it uses less digits than its factorization.

19781656360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11501017 (or 11501013 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 19781656360 in words is "nineteen billion, seven hundred eighty-one million, six hundred fifty-six thousand, three hundred sixty".