1966560211738 has 4 divisors (see below), whose sum is σ = 2949840317610. Its totient is φ = 983280105868.

The previous prime is 1966560211699. The next prime is 1966560211753. The reversal of 1966560211738 is 8371120656691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1212846271849 + 753713939889 = 1101293^2 + 868167^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 491640052933 + ... + 491640052936.

Almost surely, 2^{1966560211738} is an apocalyptic number.

1966560211738 is a deficient number, since it is larger than the sum of its proper divisors (983280105872).

1966560211738 is an equidigital number, since it uses as much as digits as its factorization.

1966560211738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983280105871.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 1966560211738 in words is "one trillion, nine hundred sixty-six billion, five hundred sixty million, two hundred eleven thousand, seven hundred thirty-eight".