19740661508 has 12 divisors (see below), whose sum is σ = 34608183372. Its totient is φ = 9852609120.

The previous prime is 19740661471. The next prime is 19740661547. The reversal of 19740661508 is 80516604791.

It can be written as a sum of positive squares in 2 ways, for example, as 2396298304 + 17344363204 = 48952^2 + 131698^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4427903 + ... + 4432358.

It is an arithmetic number, because the mean of its divisors is an integer number (2884015281).

Almost surely, 2^19740661508 is an apocalyptic number.

It is an amenable number.

19740661508 is a deficient number, since it is larger than the sum of its proper divisors (14867521864).

19740661508 is a wasteful number, since it uses less digits than its factorization.

19740661508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8860822 (or 8860820 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 19740661508 in words is "nineteen billion, seven hundred forty million, six hundred sixty-one thousand, five hundred eight".