19776949960 has 16 divisors (see below), whose sum is σ = 44498137500. Its totient is φ = 7910779968.

The previous prime is 19776949931. The next prime is 19776949987. The reversal of 19776949960 is 6994967791.

It can be written as a sum of positive squares in 2 ways, for example, as 19320444004 + 456505956 = 138998^2 + 21366^2 .

It is a super-2 number, since 2×19776949960² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247211835 + ... + 247211914.

Almost surely, 2^19776949960 is an apocalyptic number.

19776949960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19776949960 is an abundant number, since it is smaller than the sum of its proper divisors (24721187540).

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

19776949960 is a wasteful number, since it uses less digits than its factorization.

19776949960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494423760 (or 494423756 counting only the distinct ones).

The product of its (nonzero) digits is 46294416, while the sum is 67.

The spelling of 19776949960 in words is "nineteen billion, seven hundred seventy-six million, nine hundred forty-nine thousand, nine hundred sixty".