19776391336 has 16 divisors (see below), whose sum is σ = 39933098100. Its totient is φ = 9127565184.

The previous prime is 19776391291. The next prime is 19776391339. The reversal of 19776391336 is 63319367791.

It can be written as a sum of positive squares in 2 ways, for example, as 19626328836 + 150062500 = 140094^2 + 12250^2 .

It is a super-2 number, since 2×19776391336² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19776391339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95078701 + ... + 95078908.

Almost surely, 2^19776391336 is an apocalyptic number.

It is an amenable number.

19776391336 is an abundant number, since it is smaller than the sum of its proper divisors (20156706764).

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

19776391336 is a wasteful number, since it uses less digits than its factorization.

19776391336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190157628 (or 190157624 counting only the distinct ones).

The product of its digits is 3857868, while the sum is 55.

The spelling of 19776391336 in words is "nineteen billion, seven hundred seventy-six million, three hundred ninety-one thousand, three hundred thirty-six".